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#1
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Speaker Impedence ?
Hi,
If there is a better newsgroup for this question, please let me know. I want to hook up some old equipment I bought back in 1994. It's an Onkyo six cd changer, and an Onkyo amp/receiver. It's from the old Circuit City days. They were mid-range comsumer electronic components at the time. I can give model numbers if needed. The amp/receiver will power two sets of speakers, and has two buttons on the front, A and B to enable one or both sets. The rear of the amp/receiver has terminals for speakers A and B. Under the row of terminals, there is a warning: Caution Speaker A or B: 4 ohms Speaker A and B: 8 ohms I have been using a set of 6 ohm speakers and they work on either A or B, but I'd like to do things right. Should I get a set of 4 ohm speakers? Is the 8 ohm warning only necessary if I have both sets of speakers enabled, or is it relevant even if I have two sets connected, but only one enalbled at a time. I have been to Wikipedia, and googled all of this, but I'd like to hear from you. Thanks. |
#2
Posted to rec.audio.pro
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Speaker Impedence ?
Boris: With impedance, go over, but
never under! I don't know any of the math associated with impedance, but if your receiver say 4ohms that is just the minimum you never go below. You can drive 12ohm speakers with it, just might not be loud enough for you. My receiver can handle 8-16ohm speakers(It's a 22 year old JVC). I can run 8ohm and up with it, never down. |
#3
Posted to rec.audio.pro
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Speaker Impedence ?
Boris wrote:
If there is a better newsgroup for this question, please let me know. That would be rec.audio.tech. The amp/receiver will power two sets of speakers, and has two buttons on the front, A and B to enable one or both sets. The rear of the amp/receiver has terminals for speakers A and B. Under the row of terminals, there is a warning: Caution Speaker A or B: 4 ohms Speaker A and B: 8 ohms These are minimum ratings. If you use just one set of speakers, 4 ohm speakers are fine. If you use both at the same time, you need 8 ohm or higher. I have been using a set of 6 ohm speakers and they work on either A or B, but I'd like to do things right. That's fine, just don't use two sets of 6 ohm speakers. Should I get a set of 4 ohm speakers? Buy speakers that sound good, don't worry about the impedance. Worry about how they sound. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
Posted to rec.audio.pro
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Speaker Impedence ?
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#6
Posted to rec.audio.pro
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Speaker Impedence ?
Scott Dorsey wrote:
"That's fine, just don't use two sets of 6 ohm speakers" Why not? They're above the minimum stated on the back of his receiver. "Buy speakers that sound good, don't worry about the impedance. Â*Worry about how they sound" Typical 'engineer' statement. Fine: Remove all impedance specs from the backs of speakers, receivers, and amplifiers. While we're at it, remove signal presence and OL single LED indicators and all the meters from DAWs and mixing consoles. Remove the specifications page from the website and from the operators manuals. It doesn't matter right? Whether to run balanced or unbalanced lines, whether this component is over heating, that one is distorting, or the other one is clipping. As long as it "sounds good" "Use your ears"!!! Ave Maria purissmo... |
#7
Posted to rec.audio.pro
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Speaker Impedence ?
Scott Dorsey wrote:
"That's fine, just don't use two sets of 6 ohm speakers" Why not? They're above the minimum stated on the back of his receiver. "Buy speakers that sound good, don't worry about the impedance. Â*Worry about how they sound" Typical 'engineer' statement. Fine: Remove all impedance specs from the backs of speakers, receivers, and amplifiers. While we're at it, remove signal presence and OL single LED indicators and all the meters from DAWs and mixing consoles. Remove the specifications page from the website and from the operators manuals. It doesn't matter right? Whether to run balanced or unbalanced lines, whether this component is over heating, that one is distorting, or the other one is clipping. As long as it "sounds good" "Use your ears"!!! Ave Maria purissmo... |
#8
Posted to rec.audio.pro
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Speaker Impedence ?
Scott Dorsey wrote:
"That's fine, just don't use two sets of 6 ohm speakers" Why not? They're above the minimum stated on the back of his receiver. "Buy speakers that sound good, don't worry about the impedance. Â*Worry about how they sound" Typical 'engineer' statement. Fine: Remove all impedance specs from the backs of speakers, receivers, and amplifiers. While we're at it, remove signal presence and OL single LED indicators and all the meters from DAWs and mixing consoles. Remove the specifications page from the website and from the operators manuals. It doesn't matter right? Whether to run balanced or unbalanced lines, whether this component is over heating, that one is distorting, or the other one is clipping. As long as it "sounds good" "Use your ears"!!! Ave Maria purissmo... |
#9
Posted to rec.audio.pro
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Speaker Impedence ?
Boris wrote:
(Scott Dorsey) wrote in These are minimum ratings. If you use just one set of speakers, 4 ohm speakers are fine. If you use both at the same time, you need 8 ohm or higher. When you say 'at the same time', could I have two sets of 4 ohm speakers connected, but only play through one set,say set A enabled, at a time? Or, is just having two sets of 4 ohm speakers connected at the same time, even if only one set is playing, incorrect? If only one set is selected, it's fine. The problem is that sooner or later, if the buttons allow both sets to be selected, someone will do that. You can put a big sign on it saying not to do that, but someday it will happen and then the output stage will fail. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#10
Posted to rec.audio.pro
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Speaker Impedence ?
On 4/28/2017 8:57 AM, Boris wrote:
The amp/receiver will power two sets of speakers, and has two buttons on the front, A and B to enable one or both sets. The rear of the amp/receiver has terminals for speakers A and B. Under the row of terminals, there is a warning: Caution Speaker A or B: 4 ohms Speaker A and B: 8 ohms I have been using a set of 6 ohm speakers and they work on either A or B, but I'd like to do things right. Should I get a set of 4 ohm speakers? Nope, not unless you get some that will be a significant improvement over what you already have, for reasons other than impedance. What they're trying to tell you here is that the amplifier is perfectly comfortable driving a 4 ohm load (which would be two 8 ohm speakers in parallel) but it wouldn't be happy driving a 2 ohm load (two 4 ohm speakers in parallel). Speaker impedance is mostly nominal anyway, and can vary a great amount with frequency. Also, speaker efficiency also varies a lot. This means that for an average power of 1 watt going to the speaker (whatever voltage it takes for a given impedance) not all speakers will play at the same loudness. Is the 8 ohm warning only necessary if I have both sets of speakers enabled, or is it relevant even if I have two sets connected, but only one enalbled at a time. If you have two sets of speakers connected and use only one set at a time, that's the same as having only one set of speakers connected. So you could connect two sets of 4 ohm speakers and use them one at a time with no worries. In truth, you could probably use them both together and not cause any trouble unless you're running them very loud. -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio" - John Watkinson Drop by http://mikeriversaudio.wordpress.com now and then |
#11
Posted to rec.audio.pro
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Speaker Impedence ?
On 4/28/2017 11:51 AM, Boris wrote:
Wish I had kept some of my old tube equipment from the mid-70s. But, the capacitors may be dried out by now. It can be fixed. But tube amplifiers are different from solid state amplifiers in many ways. A solid state amplifier has a very low output impedance, which makes the voltage that the speaker sees pretty much the same for an 8 ohm or a 4 ohm speaker. But for the same applied voltage, the 4 ohm speaker will draw twice as much current, and that's what makes the amplifier sweat. A tube amplifier has an output transformer which has a higher source impedance, and they make an attempt to match the source (transformer output) impedance to the load impedance by putting a couple of taps on the transformer secondary. For a given input signal level, the 4 ohm tap provides a lower voltage than the 8 ohm tap. You get maximum power transferred from the amplifier to the speaker when the load and source impedances are equal. The other thing about tube amplifiers is that it's not a good idea to run them with no load on the output transformer. It's not always the case, but some times the unloaded voltage can get so high that the transformer will arc between turns of the coil and could be damaged expensively. -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio" - John Watkinson Drop by http://mikeriversaudio.wordpress.com now and then |
#12
Posted to rec.audio.pro
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Speaker Impedence ?
On 29/04/2017 3:57 a.m., Boris wrote:
Hi, If there is a better newsgroup for this question, please let me know. I want to hook up some old equipment I bought back in 1994. It's an Onkyo six cd changer, and an Onkyo amp/receiver. It's from the old Circuit City days. They were mid-range comsumer electronic components at the time. I can give model numbers if needed. The amp/receiver will power two sets of speakers, and has two buttons on the front, A and B to enable one or both sets. The rear of the amp/receiver has terminals for speakers A and B. Under the row of terminals, there is a warning: Caution Speaker A or B: 4 ohms Speaker A and B: 8 ohms I have been using a set of 6 ohm speakers and they work on either A or B, but I'd like to do things right. Should I get a set of 4 ohm speakers? Is the 8 ohm warning only necessary if I have both sets of speakers enabled, or is it relevant even if I have two sets connected, but only one enalbled at a time. I have been to Wikipedia, and googled all of this, but I'd like to hear from you. Thanks. Should be fine for one pair of 6 ohm speakers on A or B. Looks like the limiting factor is 4 ohm minimum impedance, which would be 3 if you had two pairs attached at the same time, as it could seem to be one stereo amp with simple switching on the output, or a 4-channel amp with a power-supply limitation to driving a total total of 2 x 4 ohms. geoff |
#13
Posted to rec.audio.pro
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Speaker Impedence ?
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#14
Posted to rec.audio.pro
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Speaker Impedence ?
On 29/04/2017 7:14 a.m., Boris wrote:
When you say 'at the same time', could I have two sets of 4 ohm speakers connected, but only play through one set,say set A enabled, at a time? Yes, but sounds like a recipe for disaster as a 2 ohm load may be momentarily applied at the wrong moment ... geoff |
#16
Posted to rec.audio.pro
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Speaker Impedence ?
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#17
Posted to rec.audio.pro
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Speaker Impedence ?
geoff wrote: "
I hope you were joking (not always apparent). Sounds great, still sounds great, oh it's stopped completely. Too late. geoff " I was stone-cold serious geoff. Scott Dorsey and Ian Shepard are two of the biggest "use your ears"/ "whatever sounds best" advocates in and out of rec.audio.pro. So I meant it: Why label the backs of amps and speakers with impedance ranges, have meters on equipment, or have specification sheets, since specs "don't matter" according to those two? Take altimeters out of planes and speedometers out of cars & trucks while we're at it - just fly as high as feels comfortable, and go with the flow in traffic! |
#18
Posted to rec.audio.pro
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Speaker Impedence ?
Boris wrote:
Is the 8 ohm warning only necessary if I have both sets of speakers enabled, or is it relevant even if I have two sets connected, but only one enalbled at a time. ** The warning is about using a load that has an impedance less than 4 ohms - cos the makers figure the amp is at it's safe limit with that number. But makers also know that overheating will not occur unless the amp is played to its output power limit - as it might be during a party. You need to keep both facts in mind. ..... Phil |
#20
Posted to rec.audio.pro
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Speaker Impedence ?
thekmahhhhh @ dum****.retard.doh wrote in message ... Scott Dorsey wrote: Remove all impedance specs from the backs of speakers, receivers, and amplifiers. While we're at it, remove signal presence and OL single LED indicators and all the meters from DAWs and mixing consoles. Remove the specifications page from the website and from the operators manuals And remove your retarded skull from your rectum. Your colon cancer has spread to your tiny little brain, due to direct physical contact. In your case, since you dont give a **** what anything actually sounds like, and your shoe-size IQ won't allow you to use anything resembling reason, you should just buy whatever the **** appeals to your grape-sized intellect, and keep a bucket of gasoline handy to douse the amplifier when it gets to hot. You should probably just re-wire your entire home electrical system, guided by random eejits on the net. When the code requires you to do the arithmetic, just connect your toaster to the bus bars with jumper cables. LKHSD, BDQNAPDJBF. FCKWAFA! |
#21
Posted to rec.audio.pro
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Speaker Impedence ?
Mike Rivers wrote:
But tube amplifiers are different from solid state amplifiers in many ways. A solid state amplifier has a very low output impedance, which makes the voltage that the speaker sees pretty much the same for an 8 ohm or a 4 ohm speaker. But for the same applied voltage, the 4 ohm speaker will draw twice as much current, and that's what makes the amplifier sweat. ** Typical SS amps for home hi-fi have output impedances around 0.1 ohms. The speaker lead adds maybe 0.3 ohms to that - so 0.4 ohms all up. A tube amplifier has an output transformer which has a higher source impedance, and they make an attempt to match the source (transformer output) impedance to the load impedance by putting a couple of taps on the transformer secondary. ** The output impedance of a good quality tube amp is around 0.5 to 1 ohm when used at the 8 ohms setting. For a given input signal level, the 4 ohm tap provides a lower voltage than the 8 ohm tap. ** But with 40% more current available. You get maximum power transferred from the amplifier to the speaker when the load and source impedances are equal. ** More precisely, when the two are *matched* - so an 8ohms load on the 8ohm setting and so on. However, actual speaker impedance varies widely over the audio range so it is only gonna be "matched" in the mid band - around 200 to 500 Hz. ..... Phil |
#22
Posted to rec.audio.pro
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Speaker Impedence ?
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#23
Posted to rec.audio.pro
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Speaker Impedence ?
On Friday, April 28, 2017 at 12:14:51 PM UTC-4, wrote:
Boris: With impedance, go over, but never under! I don't know any of the math associated with impedance, but if your receiver say 4ohms that is just the minimum you never go below. You can drive 12ohm speakers with it, just might not be loud enough for you. My receiver can handle 8-16ohm speakers(It's a 22 year old JVC). I can run 8ohm and up with it, never down. My woofer stopped woofing. I blame it on speaker Impotence. Jack |
#24
Posted to rec.audio.pro
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Speaker Impedence ?
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#25
Posted to rec.audio.pro
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Speaker Impedence ?
Ron Capik wrote: "I'll give K-Man a tiny bit of credit for having learned
a few things since he started posting here. " Thanks! "When Scott and others here say "use your ears" there are a lot of unstated assumptions that pro and semi-pro understand with out the need for a detailed /caveat/ list." Well, we all know about ASSuming, and one would have to BE one by stating that documentation and metering are not important. To them I say: Both meters and ears matter! |
#26
Posted to rec.audio.pro
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Speaker Impedence ?
On 4/29/2017 6:09 AM, geoff wrote:
If anything I would have expected your tweeter to blow. When they're out of phase, they suck. -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio" - John Watkinson Drop by http://mikeriversaudio.wordpress.com now and then |
#27
Posted to rec.audio.pro
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Speaker Impedence ?
wrote:
Scott Dorsey and Ian Shepard are two of the biggest "use your ears"/ "whatever sounds best" advocates in and out of rec.audio.pro. So I meant it: Why label the backs of amps and speakers with impedance ranges, have meters on equipment, or have specification sheets, since specs "don't matter" according to those two? Take altimeters out of planes and speedometers out of cars & trucks while we're at it - just fly as high as feels comfortable, and go with the flow in traffic! If your specification sheet consists only of useless information like a scalar impedance number (which really bears little connection to the actual speaker impedance plot), a frequency range without tolerances (which is utterly meaningless) and speaker power ratings that are made up by someone in the marketing department, then by all means we should definitely not have specification sheets. Because these are not actual specifications, they are not actual measurements, they are more misleading than helpful. Making decisions based on such information is not going to do you any good, it will only give you a false sense of being informed when you are not. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#28
Posted to rec.audio.pro
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Speaker Impedence ?
On Friday, April 28, 2017 at 10:40:04 PM UTC-4, Ron C wrote:
On 4/28/2017 9:38 PM, geoff wrote: On 29/04/2017 9:59 a.m., wrote: Scott Dorsey wrote: "That's fine, just don't use two sets of 6 ohm speakers" Why not? They're above the minimum stated on the back of his receiver. "Buy speakers that sound good, don't worry about the impedance. Worry about how they sound" Typical 'engineer' statement. Fine: Remove all impedance specs from the backs of speakers, receivers, and amplifiers. While we're at it, remove signal presence and OL single LED indicators and all the meters from DAWs and mixing consoles. Remove the specifications page from the website and from the operators manuals. It doesn't matter right? Whether to run balanced or unbalanced lines, whether this component is over heating, that one is distorting, or the other one is clipping. As long as it "sounds good" "Use your ears"!!! Ave Maria purissmo... It was stupid once. Thrice is stupider. geoff I'll give K-Man a tiny bit of credit for having learned a few things since he started posting here. However, it seems the world of difference between consumer gear "specs" and pro gear specs. [The quality of /prosumer/ specs are a total toss-up.] Feel, so called, audiophiles depend 100% on equipment, hoping it will make the music they like sound better!! You see people making money with HD files, HD CD, HD this and that, just like Pono stuff, but so many don't know HQ audio if it bit them in the arse! Jack When Scott and others here say "use your ears" there are a lot of unstated assumptions that pro and semi-pro understand with out the need for a detailed /caveat/ list. == Later... Ron Capik -- |
#29
Posted to rec.audio.pro
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Speaker Impedence ?
On Saturday, April 29, 2017 at 9:10:28 AM UTC-4, geoff wrote:
On 29/04/2017 11:52 PM, wrote: On Friday, April 28, 2017 at 12:14:51 PM UTC-4, wrote: Boris: With impedance, go over, but never under! I don't know any of the math associated with impedance, but if your receiver say 4ohms that is just the minimum you never go below. You can drive 12ohm speakers with it, just might not be loud enough for you. My receiver can handle 8-16ohm speakers(It's a 22 year old JVC). I can run 8ohm and up with it, never down. My woofer stopped woofing. I blame it on speaker Impotence. Jack If anything I would have expected your tweeter to blow. Excuse me, but 3kHz is Midrange!! I'm lovin' my Sony headphones, they allow me to hear tape [hiss] noise, gives me a better idea of limitations. Like, wow, The Partridge Family, I never knew there as a tambourine, but now I hear one. Time to embarrass Sony Music once again!! Jack geoff |
#30
Posted to rec.audio.pro
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Speaker Impedence ?
On Saturday, April 29, 2017 at 10:03:03 AM UTC-4, Mike Rivers wrote:
On 4/29/2017 6:09 AM, geoff wrote: If anything I would have expected your tweeter to blow. When they're out of phase, they suck. Watch that use of "phase", you don't want to upset Scott, do you? Jack :-) -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio" - John Watkinson Drop by http://mikeriversaudio.wordpress.com now and then |
#31
Posted to rec.audio.pro
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Speaker Impedence ?
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#32
Posted to rec.audio.pro
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Speaker Impedence ?
On Saturday, April 29, 2017 at 2:24:56 PM UTC-4, John Williamson wrote:
On 29/04/2017 14:14, wrote: Ron Capik wrote: "I'll give K-Man a tiny bit of credit for having learned a few things since he started posting here. " Thanks! "When Scott and others here say "use your ears" there are a lot of unstated assumptions that pro and semi-pro understand with out the need for a detailed /caveat/ list." Well, we all know about ASSuming, and one would have to BE one by stating that documentation and metering are not important. To them I say: Both meters and ears matter! When specifying pro gear, meters and ears are both important as the limits within which it will work to the spec are important, both for its intended use and its maximum life, bearing in mind that pro gear tends to be run much closer to its limits than a home audio setup. With consumer gear, specifications are generally much wider, and quality is more variable within a run of stuff off the line, and as long as you are running within its limits, metering and close attention to impedances isn't all that important since the dawn of direct coupled transistor amplifiers, which brought an end to the need to match the output stage and transformer to the speaker impedances. Even the lower limit of impedance stated by the maker will have a margin built in, so in the case under consideration here, the amplifier will survive two sets of 4 ohm speakers in parallel, subject to a possibility of instability due to power supply overloading, and thermal problems if the volume is turned up too high, so causing the output transistors to exceed their safe dissipation levels. Hence Scott and others will say of consumer gear "Use your ears, and of it sounds good, that's okay." When they are setting up a session or building a studio, repeatability is important, so they use meters and cheat sheets to document the setup, so that the next session is the same as the current one. For non critical applications, then "Use your ears" is a good rule for pro gear and setups as well, as long as the original specification was done correctly. Use your ears with what, a Test CD with sweep frequency 20-20 kHz? I may agree, man can detect distortion with 160 kbps MP3, but only with a single tone, but with complex music, no way can he hear what is actually distorted. Now, are you talking thermal runaway with transistors and thermal noise, such as between metal film and carbon deposit resistors? Jack -- Tciao for Now! John. |
#33
Posted to rec.audio.pro
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Speaker Impedence ?
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#34
Posted to rec.audio.pro
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Speaker Impedence ?
On 4/29/2017 12:02 PM, wrote:
Use your ears with what, a Test CD with sweep frequency 20-20 kHz? Sure, if that's what you intend to listen to all the time. Better to find a well recorded example of the sort of music you enjoy. Your job is to find it. I may agree, man can detect distortion with 160 kbps MP3, but only with a single tone, but with complex music, no way can he hear what is actually distorted. This isn't distortion in the classic harmonic sense. MP3 removes what it thinks you can't hear anyway. Sometimes it's right, sometimes it gets it wrong. The closer to a constantly clipped waveform that goes into the process, the harder time it has deciding what's music and what's masking noise. -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio" - John Watkinson Drop by http://mikeriversaudio.wordpress.com now and then |
#35
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Speaker Impedence ?
John Williamson wrote:
Even the lower limit of impedance stated by the maker will have a margin built in, so in the case under consideration here, the amplifier will survive two sets of 4 ohm speakers in parallel, subject to a possibility of instability due to power supply overloading, and thermal problems if the volume is turned up too high, so causing the output transistors to exceed their safe dissipation levels. ** Why the technobabble? Output transistors have a temperature limit, beyond which self destruction of the chip is a certainty - followed by DC rail voltage appearing on the output. Something to be carefully avoided. IME few domestic amps have good heatsink overtemp or DC on the speaker line protection. ..... Phil |
#36
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Speaker Impedence ?
Phil Allison wrote: "
** Why the technobabble? Output transistors have a temperature limit, beyond which self destruction of the chip is a certainty - followed by DC rail voltage appearing on the output. Something to be carefully avoided. IME few domestic amps have good heatsink overtemp or DC on the speaker line protection. ..... Phil " In plainer terms, ENGINEERS: Obey the specs! |
#37
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Speaker Impedence ?
The poor OP comes here to ask a simple question
and starts a bru hah ha. Whats the matter with kids these days? M |
#38
Posted to rec.audio.pro
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Speaker Impedence ?
On 30/04/2017 10:07 PM, wrote:
Phil Allison wrote: " ** Why the technobabble? Output transistors have a temperature limit, beyond which self destruction of the chip is a certainty - followed by DC rail voltage appearing on the output. Something to be carefully avoided. IME few domestic amps have good heatsink overtemp or DC on the speaker line protection. .... Phil " In plainer terms, ENGINEERS: Obey the specs! But what ARE the specs on such a vague spec. Try this: B&W 800 D3 Nominal Impedence 8 ohms (minimum 3.0 ohms) http://www.bowers-wilkins.net/Speake...nd/800-D3.html geoff |
#39
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Speaker Impedence ?
geoff wrote:
In plainer terms, ENGINEERS: Obey the specs! But what ARE the specs on such a vague spec. Try this: B&W 800 D3 Nominal Impedence 8 ohms (minimum 3.0 ohms) ** Can you post an impedance curve for the model ? The maker says 8 ohms nominal and B&W are not likely to be liars. Bet that 3 ohm minimum is way outisde the power band of music programme. FYI: The Quad ESL57 is quoted as nominal 16ohm, with a minimum of 1.7 ohms. 1.7ohms at 18kHz, only. ..... Phil |
#40
Posted to rec.audio.pro
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Speaker Impedence ?
On 1/05/2017 9:45 PM, Phil Allison wrote:
geoff wrote: In plainer terms, ENGINEERS: Obey the specs! But what ARE the specs on such a vague spec. Try this: B&W 800 D3 Nominal Impedence 8 ohms (minimum 3.0 ohms) ** Can you post an impedance curve for the model ? The maker says 8 ohms nominal and B&W are not likely to be liars. Bet that 3 ohm minimum is way outisde the power band of music programme. FYI: The Quad ESL57 is quoted as nominal 16ohm, with a minimum of 1.7 ohms. 1.7ohms at 18kHz, only. I used to run 2 pairs, 2 in series each side, which made things a little easier. Now I have (stored away somewhere) a pair of ESL-63s, plus a scrap one for parts, that are a pretty constant 8 ohms which comes across as pretty much purely resistive. Here's the best that google can find on B&W 800 Z (for an older lesser version). http://www.stereophile.com/content/b...lSCLXF6qtJv.97 geoff |
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