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#1
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Noise from speakers
Hope someone can help point me in the right direction on this one..!
I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy |
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#2
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Noise from speakers
AC wrote in message . ..
Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#3
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Noise from speakers
AC wrote in message . ..
Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#4
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Noise from speakers
AC wrote in message . ..
Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#5
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Noise from speakers
AC wrote in message . ..
Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#6
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Noise from speakers
AC wrote:
Hope someone can help point me in the right direction on this one..! It had been easier if you hadn't gotten a new amp ... I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. Loudspeakers in ear height and possibly a lower level of background noise are possible explanations. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. The problem you have is one of simple sensitivity mismatch, you appear to have efficient loudspeakers and thus the input signal level to your poweramp required for preferred SPL is too low. The result of this is that pre-amplifier noise is audible. The cure is to add an attenuator to the input of the power amp. It is required that the attenuator should be inserted in the signal chain _after_ line amp that follows the volume control in normal circuit designs. It is not very likely that modern audio contraptions are solder friendly inside. It is possible that integration also means that there is no lineamp after the volume control, i.e. that the next stage is the poweramplifier input. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, This is because it disconnects the loudspeakers. so I don't think the receiver is at fault. Probably not. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? A servicemanual and (worst case) considerable proficiency in smd soldering, or separate pre- and powerstages so that you can align the input sensitivity correctly. Generally all current designs can be described as flawed by doing as they always did, i. e. aim for having 0.5 to 1 volts be enought to drive a power amp to full nominal output in spite of max peak output from CD-players being 2 volts. Preamplifier stages can generally deliver some 7 volts out, which is why you have 20 dB more preamp noise than you would have with a sensible equipment design. Thanks! YMMV - this is not a new problem for the audio industry, the very first issue of the Danish magazine "High Fidelity" that I purchased around 1971 contained advise to a Lowther owner that is in fact paraphrased and enhanced above. Their suggestion was a 12 dB attenuator, a bit more or a bit less may suit the actual setup better. It has been only 33 years, please do allow some extra time for the industry to understand this problem (x), it may be that it is not yet adequately documented or that the books at the tech highschool libraries all constructions originate in have not yet been replaced. (x) To my knowledge one preamp only (Kenwood's 07) has addressed this issue in its design, and the users could not understand the concept so the had to modify it to "old style" in version 2. -Andy Kind regards Peter Larsen -- ******************************************* * My site is at: http://www.muyiovatki.dk * ******************************************* |
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#7
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Noise from speakers
AC wrote:
Hope someone can help point me in the right direction on this one..! It had been easier if you hadn't gotten a new amp ... I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. Loudspeakers in ear height and possibly a lower level of background noise are possible explanations. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. The problem you have is one of simple sensitivity mismatch, you appear to have efficient loudspeakers and thus the input signal level to your poweramp required for preferred SPL is too low. The result of this is that pre-amplifier noise is audible. The cure is to add an attenuator to the input of the power amp. It is required that the attenuator should be inserted in the signal chain _after_ line amp that follows the volume control in normal circuit designs. It is not very likely that modern audio contraptions are solder friendly inside. It is possible that integration also means that there is no lineamp after the volume control, i.e. that the next stage is the poweramplifier input. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, This is because it disconnects the loudspeakers. so I don't think the receiver is at fault. Probably not. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? A servicemanual and (worst case) considerable proficiency in smd soldering, or separate pre- and powerstages so that you can align the input sensitivity correctly. Generally all current designs can be described as flawed by doing as they always did, i. e. aim for having 0.5 to 1 volts be enought to drive a power amp to full nominal output in spite of max peak output from CD-players being 2 volts. Preamplifier stages can generally deliver some 7 volts out, which is why you have 20 dB more preamp noise than you would have with a sensible equipment design. Thanks! YMMV - this is not a new problem for the audio industry, the very first issue of the Danish magazine "High Fidelity" that I purchased around 1971 contained advise to a Lowther owner that is in fact paraphrased and enhanced above. Their suggestion was a 12 dB attenuator, a bit more or a bit less may suit the actual setup better. It has been only 33 years, please do allow some extra time for the industry to understand this problem (x), it may be that it is not yet adequately documented or that the books at the tech highschool libraries all constructions originate in have not yet been replaced. (x) To my knowledge one preamp only (Kenwood's 07) has addressed this issue in its design, and the users could not understand the concept so the had to modify it to "old style" in version 2. -Andy Kind regards Peter Larsen -- ******************************************* * My site is at: http://www.muyiovatki.dk * ******************************************* |
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#8
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Noise from speakers
AC wrote:
Hope someone can help point me in the right direction on this one..! It had been easier if you hadn't gotten a new amp ... I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. Loudspeakers in ear height and possibly a lower level of background noise are possible explanations. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. The problem you have is one of simple sensitivity mismatch, you appear to have efficient loudspeakers and thus the input signal level to your poweramp required for preferred SPL is too low. The result of this is that pre-amplifier noise is audible. The cure is to add an attenuator to the input of the power amp. It is required that the attenuator should be inserted in the signal chain _after_ line amp that follows the volume control in normal circuit designs. It is not very likely that modern audio contraptions are solder friendly inside. It is possible that integration also means that there is no lineamp after the volume control, i.e. that the next stage is the poweramplifier input. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, This is because it disconnects the loudspeakers. so I don't think the receiver is at fault. Probably not. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? A servicemanual and (worst case) considerable proficiency in smd soldering, or separate pre- and powerstages so that you can align the input sensitivity correctly. Generally all current designs can be described as flawed by doing as they always did, i. e. aim for having 0.5 to 1 volts be enought to drive a power amp to full nominal output in spite of max peak output from CD-players being 2 volts. Preamplifier stages can generally deliver some 7 volts out, which is why you have 20 dB more preamp noise than you would have with a sensible equipment design. Thanks! YMMV - this is not a new problem for the audio industry, the very first issue of the Danish magazine "High Fidelity" that I purchased around 1971 contained advise to a Lowther owner that is in fact paraphrased and enhanced above. Their suggestion was a 12 dB attenuator, a bit more or a bit less may suit the actual setup better. It has been only 33 years, please do allow some extra time for the industry to understand this problem (x), it may be that it is not yet adequately documented or that the books at the tech highschool libraries all constructions originate in have not yet been replaced. (x) To my knowledge one preamp only (Kenwood's 07) has addressed this issue in its design, and the users could not understand the concept so the had to modify it to "old style" in version 2. -Andy Kind regards Peter Larsen -- ******************************************* * My site is at: http://www.muyiovatki.dk * ******************************************* |
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#9
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Noise from speakers
AC wrote:
Hope someone can help point me in the right direction on this one..! It had been easier if you hadn't gotten a new amp ... I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. Loudspeakers in ear height and possibly a lower level of background noise are possible explanations. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. The problem you have is one of simple sensitivity mismatch, you appear to have efficient loudspeakers and thus the input signal level to your poweramp required for preferred SPL is too low. The result of this is that pre-amplifier noise is audible. The cure is to add an attenuator to the input of the power amp. It is required that the attenuator should be inserted in the signal chain _after_ line amp that follows the volume control in normal circuit designs. It is not very likely that modern audio contraptions are solder friendly inside. It is possible that integration also means that there is no lineamp after the volume control, i.e. that the next stage is the poweramplifier input. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, This is because it disconnects the loudspeakers. so I don't think the receiver is at fault. Probably not. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? A servicemanual and (worst case) considerable proficiency in smd soldering, or separate pre- and powerstages so that you can align the input sensitivity correctly. Generally all current designs can be described as flawed by doing as they always did, i. e. aim for having 0.5 to 1 volts be enought to drive a power amp to full nominal output in spite of max peak output from CD-players being 2 volts. Preamplifier stages can generally deliver some 7 volts out, which is why you have 20 dB more preamp noise than you would have with a sensible equipment design. Thanks! YMMV - this is not a new problem for the audio industry, the very first issue of the Danish magazine "High Fidelity" that I purchased around 1971 contained advise to a Lowther owner that is in fact paraphrased and enhanced above. Their suggestion was a 12 dB attenuator, a bit more or a bit less may suit the actual setup better. It has been only 33 years, please do allow some extra time for the industry to understand this problem (x), it may be that it is not yet adequately documented or that the books at the tech highschool libraries all constructions originate in have not yet been replaced. (x) To my knowledge one preamp only (Kenwood's 07) has addressed this issue in its design, and the users could not understand the concept so the had to modify it to "old style" in version 2. -Andy Kind regards Peter Larsen -- ******************************************* * My site is at: http://www.muyiovatki.dk * ******************************************* |
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#10
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Noise from speakers
If you are using passive speakers, this would be obviously from the amp
unit. This is a common fault with most low end consumer type amplifiers when very efficient speakers are connected. This noise may be generated in either the power amp, or preamp sections. If you can find a way to have an attenuation between the preamp out to the power amp input stage this would probably help, but would decrease the output level of the amp. You would have to put in the attenuation that is equivalent to the noise increase, in order to neutralize it. The next problem would be, if the power amp itself was the noise making section, and not the preamp section. You would have to use an oscilloscope to investigate the actual source of the noise in signal path, to see where it is being generated. The best way around this is to have a very good audio system with a properly matched set of speakers. The higher end systems make very little audible noise if any, even if you put your ear right up to the tweeter or any of the speaker drivers themselves. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "AC" wrote in message ... Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy |
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#11
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Noise from speakers
If you are using passive speakers, this would be obviously from the amp
unit. This is a common fault with most low end consumer type amplifiers when very efficient speakers are connected. This noise may be generated in either the power amp, or preamp sections. If you can find a way to have an attenuation between the preamp out to the power amp input stage this would probably help, but would decrease the output level of the amp. You would have to put in the attenuation that is equivalent to the noise increase, in order to neutralize it. The next problem would be, if the power amp itself was the noise making section, and not the preamp section. You would have to use an oscilloscope to investigate the actual source of the noise in signal path, to see where it is being generated. The best way around this is to have a very good audio system with a properly matched set of speakers. The higher end systems make very little audible noise if any, even if you put your ear right up to the tweeter or any of the speaker drivers themselves. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "AC" wrote in message ... Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy |
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#12
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Noise from speakers
If you are using passive speakers, this would be obviously from the amp
unit. This is a common fault with most low end consumer type amplifiers when very efficient speakers are connected. This noise may be generated in either the power amp, or preamp sections. If you can find a way to have an attenuation between the preamp out to the power amp input stage this would probably help, but would decrease the output level of the amp. You would have to put in the attenuation that is equivalent to the noise increase, in order to neutralize it. The next problem would be, if the power amp itself was the noise making section, and not the preamp section. You would have to use an oscilloscope to investigate the actual source of the noise in signal path, to see where it is being generated. The best way around this is to have a very good audio system with a properly matched set of speakers. The higher end systems make very little audible noise if any, even if you put your ear right up to the tweeter or any of the speaker drivers themselves. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "AC" wrote in message ... Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy |
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#13
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Noise from speakers
If you are using passive speakers, this would be obviously from the amp
unit. This is a common fault with most low end consumer type amplifiers when very efficient speakers are connected. This noise may be generated in either the power amp, or preamp sections. If you can find a way to have an attenuation between the preamp out to the power amp input stage this would probably help, but would decrease the output level of the amp. You would have to put in the attenuation that is equivalent to the noise increase, in order to neutralize it. The next problem would be, if the power amp itself was the noise making section, and not the preamp section. You would have to use an oscilloscope to investigate the actual source of the noise in signal path, to see where it is being generated. The best way around this is to have a very good audio system with a properly matched set of speakers. The higher end systems make very little audible noise if any, even if you put your ear right up to the tweeter or any of the speaker drivers themselves. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "AC" wrote in message ... Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy |
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#14
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Noise from speakers
Any suggestions or ideas for what I should look for next in
troubleshooting this? Try to switch off _all_ power consuming devices, except the amplifier. If this helps, switch on each device one after the other so you will notice which unit produces the noisy signal... hope it's not the refrigerator of your neighbour! Could be a high-voltage-transmission-line, too. Or other electromagnetic fields like these produces by mobile phone antennas (sender), or computers (open case?). Good luck! Olaf |
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#15
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Noise from speakers
Any suggestions or ideas for what I should look for next in
troubleshooting this? Try to switch off _all_ power consuming devices, except the amplifier. If this helps, switch on each device one after the other so you will notice which unit produces the noisy signal... hope it's not the refrigerator of your neighbour! Could be a high-voltage-transmission-line, too. Or other electromagnetic fields like these produces by mobile phone antennas (sender), or computers (open case?). Good luck! Olaf |
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#16
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Noise from speakers
Any suggestions or ideas for what I should look for next in
troubleshooting this? Try to switch off _all_ power consuming devices, except the amplifier. If this helps, switch on each device one after the other so you will notice which unit produces the noisy signal... hope it's not the refrigerator of your neighbour! Could be a high-voltage-transmission-line, too. Or other electromagnetic fields like these produces by mobile phone antennas (sender), or computers (open case?). Good luck! Olaf |
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#17
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Noise from speakers
Any suggestions or ideas for what I should look for next in
troubleshooting this? Try to switch off _all_ power consuming devices, except the amplifier. If this helps, switch on each device one after the other so you will notice which unit produces the noisy signal... hope it's not the refrigerator of your neighbour! Could be a high-voltage-transmission-line, too. Or other electromagnetic fields like these produces by mobile phone antennas (sender), or computers (open case?). Good luck! Olaf |
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#18
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Noise from speakers
AC wrote: Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy One other thing to consider, your new place may NOT have as much acoustic absorption. Things such as carpet, drapes and anything fabric can absorb high end and dull the room. How different is your new place from your old place? Bob -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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#19
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Noise from speakers
AC wrote: Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy One other thing to consider, your new place may NOT have as much acoustic absorption. Things such as carpet, drapes and anything fabric can absorb high end and dull the room. How different is your new place from your old place? Bob -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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#20
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Noise from speakers
AC wrote: Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy One other thing to consider, your new place may NOT have as much acoustic absorption. Things such as carpet, drapes and anything fabric can absorb high end and dull the room. How different is your new place from your old place? Bob -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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#21
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Noise from speakers
AC wrote: Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy One other thing to consider, your new place may NOT have as much acoustic absorption. Things such as carpet, drapes and anything fabric can absorb high end and dull the room. How different is your new place from your old place? Bob -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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#23
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Noise from speakers
Thanks to all that have posted so far
 I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! -Andy (sorry I didn't post specific stats on the speakers before, I didn't know that people would have questions on that, stats follows in case this makes any difference) JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms On 22 Jan 2004 02:43:14 -0800, (Svante) wrote: AC wrote in message . .. Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#24
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Noise from speakers
Thanks to all that have posted so far
I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! -Andy (sorry I didn't post specific stats on the speakers before, I didn't know that people would have questions on that, stats follows in case this makes any difference) JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms On 22 Jan 2004 02:43:14 -0800, (Svante) wrote: AC wrote in message . .. Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#25
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Noise from speakers
Thanks to all that have posted so far
I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! -Andy (sorry I didn't post specific stats on the speakers before, I didn't know that people would have questions on that, stats follows in case this makes any difference) JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms On 22 Jan 2004 02:43:14 -0800, (Svante) wrote: AC wrote in message . .. Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#26
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Noise from speakers
On Thu, 22 Jan 2004 10:41:34 -0500, AC
wrote: Thanks to all that have posted so far I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! It simply means that the hiss/noise comes from the portion of the amp that is after the volume control. JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms Those are quite sensitive speakers and would reveal the noise of any but the quietest amps which neither of your amps is, btw. I believe that elevating the speakers to ear level has revealed to you the hiss that was always there but not apparent when the speakers were on the floor. Kal |
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#27
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Noise from speakers
On Thu, 22 Jan 2004 10:41:34 -0500, AC
wrote: Thanks to all that have posted so far I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! It simply means that the hiss/noise comes from the portion of the amp that is after the volume control. JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms Those are quite sensitive speakers and would reveal the noise of any but the quietest amps which neither of your amps is, btw. I believe that elevating the speakers to ear level has revealed to you the hiss that was always there but not apparent when the speakers were on the floor. Kal |
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#28
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Noise from speakers
On Thu, 22 Jan 2004 10:41:34 -0500, AC
wrote: Thanks to all that have posted so far I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! It simply means that the hiss/noise comes from the portion of the amp that is after the volume control. JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms Those are quite sensitive speakers and would reveal the noise of any but the quietest amps which neither of your amps is, btw. I believe that elevating the speakers to ear level has revealed to you the hiss that was always there but not apparent when the speakers were on the floor. Kal |
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#29
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Noise from speakers
On Thu, 22 Jan 2004 10:41:34 -0500, AC
wrote: Thanks to all that have posted so far I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! It simply means that the hiss/noise comes from the portion of the amp that is after the volume control. JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms Those are quite sensitive speakers and would reveal the noise of any but the quietest amps which neither of your amps is, btw. I believe that elevating the speakers to ear level has revealed to you the hiss that was always there but not apparent when the speakers were on the floor. Kal |
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#30
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Noise from speakers
AC wrote in message . ..
Thanks to all that have posted so far I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! If the hiss originates in the power amplifier, exactly that would happen. The volume control is located BEFORE the power amplifier, so turning it down would do nothing with the power amp hiss. Turning the amplifier off eleiminates the hiss, right? If so, the hiss must originate from the amplifier (and a high sensitivity of the speakers could make the absolute level higher). JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms These speakers are pretty sensitive. Most speakers have a sensitivity of 85-90 dB. The high sensitivity would make the hiss about 4-9 dB louder than it would be with a less sensitive speaker. On 22 Jan 2004 02:43:14 -0800, (Svante) wrote: AC wrote in message . .. Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#31
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Noise from speakers
AC wrote in message . ..
Thanks to all that have posted so far I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! If the hiss originates in the power amplifier, exactly that would happen. The volume control is located BEFORE the power amplifier, so turning it down would do nothing with the power amp hiss. Turning the amplifier off eleiminates the hiss, right? If so, the hiss must originate from the amplifier (and a high sensitivity of the speakers could make the absolute level higher). JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms These speakers are pretty sensitive. Most speakers have a sensitivity of 85-90 dB. The high sensitivity would make the hiss about 4-9 dB louder than it would be with a less sensitive speaker. On 22 Jan 2004 02:43:14 -0800, (Svante) wrote: AC wrote in message . .. Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#32
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Noise from speakers
AC wrote in message . ..
Thanks to all that have posted so far I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! If the hiss originates in the power amplifier, exactly that would happen. The volume control is located BEFORE the power amplifier, so turning it down would do nothing with the power amp hiss. Turning the amplifier off eleiminates the hiss, right? If so, the hiss must originate from the amplifier (and a high sensitivity of the speakers could make the absolute level higher). JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms These speakers are pretty sensitive. Most speakers have a sensitivity of 85-90 dB. The high sensitivity would make the hiss about 4-9 dB louder than it would be with a less sensitive speaker. On 22 Jan 2004 02:43:14 -0800, (Svante) wrote: AC wrote in message . .. Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#33
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Noise from speakers
AC wrote in message . ..
Thanks to all that have posted so far I have a question for those that think it's the amp, sorry if it's a dumb question as I'm not an audio expert.. The hiss coming from the speakers stay at a constant volume level regardless of what volume level I turn the main unit to. It would seem that if the amp is at fault, turning up the volume would also increase the hiss? As it is, if I turn up the music loud enough, it drowns out the hiss. Please help me understand, thanks! If the hiss originates in the power amplifier, exactly that would happen. The volume control is located BEFORE the power amplifier, so turning it down would do nothing with the power amp hiss. Turning the amplifier off eleiminates the hiss, right? If so, the hiss must originate from the amplifier (and a high sensitivity of the speakers could make the absolute level higher). JBL CF-100 Speakers High: 14mm Ti Laminate 7 kHz+ Mid: 4.5" 1400 Hz - 7 kHz Low: 10" 1400 Hz Frequency Response 39 Hz to 20 kHz (@ -6dB) Sensitivity 94 dB (1 watt/1 meter) Nominal impedance 8 ohms These speakers are pretty sensitive. Most speakers have a sensitivity of 85-90 dB. The high sensitivity would make the hiss about 4-9 dB louder than it would be with a less sensitive speaker. On 22 Jan 2004 02:43:14 -0800, (Svante) wrote: AC wrote in message . .. Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. Any suggestions or ideas for what I should look for next in troubleshooting this? Thanks! -Andy For sure the noise originates from the amplifier(s) (I assume that the speakers are passive). IMO, the reason that you hear the noise now but not before is that you have moved the speakers closer to your ears and possibly also directed them straight towards you (?). Also, the fact that you have become aware of it, may make it hard NOT to hear the noise. Power filters and expensive speaker cables will probably not help, I think the solution is to experiment with the placement of the speakers. You COULD (but I don't recommend it) connect a resistance (say 5-20 ohms) in series with the loudspeakers if nothing else helps. This will degrade the frequency response a lot, and also the maximum possible output level, but the level of the noise will go down. At least you could try it as an experiment. Just make sure that the resistor can handle the power from the amplifier. The reason that the noise is not audible in the headphones is probably a lower sensitivity of the headphones (compared to the speakers). Do the JBLs have a high sensitivity? HTH /Svante |
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#34
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Noise from speakers
In , on 01/22/04
at 12:19 AM, AC said: Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. In the old configuration, since speakers tend to beam the highs, and the hiss is mostly highs, most of the noise never hit your ears and you didn't notice it. Elevating the speakers, brought the tweeters into line with your ears. Unfortunately, now that you have heard the noise, it will always be there. To some extent it was the tree that fell in the woods while no one was there -- it didn't make any noise. It is possible that your new apartment is much quieter than the old and the equipment noise was masked by ambient room noise. I would expect that, in general, the highs are more prominent now than in your previous listening situation. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. To some extent *ALL* amplifiers make noise. In most situations power line filters will not help. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Does lowering the volume make any difference? What source are you listening to? Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. In many cases plugging-in headphones disconnects the speakers. It's actually good that the speakers are quiet when you plug-in headphones. This is not always so. I'm working with a family that has very severe problems. They are so close to a bunch of radio and TV stations that a speaker connected to a length of wire will pick-up a radio station -- no amplifier is needed. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. While high end systems *MIGHT* be quieter, nothing will be absolutely silent -- no matter what the cost. Typically, it is the low power, low end systems that can't deliver much high frequency energy that are quiet. It's hard for me to evaluate your situation from here. We recently worked with a fellow who had a moderately high end system and was worried about the noise. When we finally heard the "noise" (one had to press an ear against the tweeter grill) it was actually very low, normal, but still audible. One oddity that you should be aware of is your air conditioning or forced air heating system. An operating air vent directly behind your listening position will emit noise that will reflect off the wall in front of you. The noise can sound a lot like amplifier noise, but turning off the equipment, even removing the speakers from the room, will not make the noise go away. ----------------------------------------------------------- spam: wordgame:123(abc):14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15 13 (Barry Mann) [sorry about the puzzle, spammers are ruining my mailbox] ----------------------------------------------------------- |
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#35
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Noise from speakers
In , on 01/22/04
at 12:19 AM, AC said: Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. In the old configuration, since speakers tend to beam the highs, and the hiss is mostly highs, most of the noise never hit your ears and you didn't notice it. Elevating the speakers, brought the tweeters into line with your ears. Unfortunately, now that you have heard the noise, it will always be there. To some extent it was the tree that fell in the woods while no one was there -- it didn't make any noise. It is possible that your new apartment is much quieter than the old and the equipment noise was masked by ambient room noise. I would expect that, in general, the highs are more prominent now than in your previous listening situation. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. To some extent *ALL* amplifiers make noise. In most situations power line filters will not help. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Does lowering the volume make any difference? What source are you listening to? Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. In many cases plugging-in headphones disconnects the speakers. It's actually good that the speakers are quiet when you plug-in headphones. This is not always so. I'm working with a family that has very severe problems. They are so close to a bunch of radio and TV stations that a speaker connected to a length of wire will pick-up a radio station -- no amplifier is needed. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. While high end systems *MIGHT* be quieter, nothing will be absolutely silent -- no matter what the cost. Typically, it is the low power, low end systems that can't deliver much high frequency energy that are quiet. It's hard for me to evaluate your situation from here. We recently worked with a fellow who had a moderately high end system and was worried about the noise. When we finally heard the "noise" (one had to press an ear against the tweeter grill) it was actually very low, normal, but still audible. One oddity that you should be aware of is your air conditioning or forced air heating system. An operating air vent directly behind your listening position will emit noise that will reflect off the wall in front of you. The noise can sound a lot like amplifier noise, but turning off the equipment, even removing the speakers from the room, will not make the noise go away. ----------------------------------------------------------- spam: wordgame:123(abc):14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15 13 (Barry Mann) [sorry about the puzzle, spammers are ruining my mailbox] ----------------------------------------------------------- |
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#36
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Noise from speakers
In , on 01/22/04
at 12:19 AM, AC said: Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. In the old configuration, since speakers tend to beam the highs, and the hiss is mostly highs, most of the noise never hit your ears and you didn't notice it. Elevating the speakers, brought the tweeters into line with your ears. Unfortunately, now that you have heard the noise, it will always be there. To some extent it was the tree that fell in the woods while no one was there -- it didn't make any noise. It is possible that your new apartment is much quieter than the old and the equipment noise was masked by ambient room noise. I would expect that, in general, the highs are more prominent now than in your previous listening situation. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. To some extent *ALL* amplifiers make noise. In most situations power line filters will not help. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Does lowering the volume make any difference? What source are you listening to? Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. In many cases plugging-in headphones disconnects the speakers. It's actually good that the speakers are quiet when you plug-in headphones. This is not always so. I'm working with a family that has very severe problems. They are so close to a bunch of radio and TV stations that a speaker connected to a length of wire will pick-up a radio station -- no amplifier is needed. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. While high end systems *MIGHT* be quieter, nothing will be absolutely silent -- no matter what the cost. Typically, it is the low power, low end systems that can't deliver much high frequency energy that are quiet. It's hard for me to evaluate your situation from here. We recently worked with a fellow who had a moderately high end system and was worried about the noise. When we finally heard the "noise" (one had to press an ear against the tweeter grill) it was actually very low, normal, but still audible. One oddity that you should be aware of is your air conditioning or forced air heating system. An operating air vent directly behind your listening position will emit noise that will reflect off the wall in front of you. The noise can sound a lot like amplifier noise, but turning off the equipment, even removing the speakers from the room, will not make the noise go away. ----------------------------------------------------------- spam: wordgame:123(abc):14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15 13 (Barry Mann) [sorry about the puzzle, spammers are ruining my mailbox] ----------------------------------------------------------- |
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#37
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Noise from speakers
In , on 01/22/04
at 12:19 AM, AC said: Hope someone can help point me in the right direction on this one..! I recently moved to a new apartment and immediately noticed a hiss coming from my speakers' tweeter and mid-range woofers (using JBL CF-100's). The hiss is quite audible from where I sit (3 feet away) and can even be heard about 10 feet away. This hiss was not present before in my system, or at least I did not notice it. If it makes any different, I originally had the speakers on the ground, and now in the new apartment have elevated the speakers about 2 feet off the ground. In the old configuration, since speakers tend to beam the highs, and the hiss is mostly highs, most of the noise never hit your ears and you didn't notice it. Elevating the speakers, brought the tweeters into line with your ears. Unfortunately, now that you have heard the noise, it will always be there. To some extent it was the tree that fell in the woods while no one was there -- it didn't make any noise. It is possible that your new apartment is much quieter than the old and the equipment noise was masked by ambient room noise. I would expect that, in general, the highs are more prominent now than in your previous listening situation. I just bought a Onkyo DR-C500 to replace the aging Aiwa mini-system, partially in the hopes of getting rid of the hiss. No luck. I also tried using a "premium" power surge protector/filter. No luck there either. I also tried cleaning and re-inserting the Monster speaker wires into the receiver. Still no luck. To some extent *ALL* amplifiers make noise. In most situations power line filters will not help. Muting the receiver seems to lessen the hiss (though it does not completely disappear). Does lowering the volume make any difference? What source are you listening to? Plugging in headphones to the receiver results in no hiss at all, so I don't think the receiver is at fault. In many cases plugging-in headphones disconnects the speakers. It's actually good that the speakers are quiet when you plug-in headphones. This is not always so. I'm working with a family that has very severe problems. They are so close to a bunch of radio and TV stations that a speaker connected to a length of wire will pick-up a radio station -- no amplifier is needed. Plugging in the small speakers from my old Aiwa mini-system to the Onkyo receiver still produces hiss. Plugging the JBL's to the Aiwa main unit produces hiss as well. While high end systems *MIGHT* be quieter, nothing will be absolutely silent -- no matter what the cost. Typically, it is the low power, low end systems that can't deliver much high frequency energy that are quiet. It's hard for me to evaluate your situation from here. We recently worked with a fellow who had a moderately high end system and was worried about the noise. When we finally heard the "noise" (one had to press an ear against the tweeter grill) it was actually very low, normal, but still audible. One oddity that you should be aware of is your air conditioning or forced air heating system. An operating air vent directly behind your listening position will emit noise that will reflect off the wall in front of you. The noise can sound a lot like amplifier noise, but turning off the equipment, even removing the speakers from the room, will not make the noise go away. ----------------------------------------------------------- spam: wordgame:123(abc):14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15 13 (Barry Mann) [sorry about the puzzle, spammers are ruining my mailbox] ----------------------------------------------------------- |
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