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#1
Posted to rec.audio.tech
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Old Amp w/ No Subwoofer Terminal
Newbie question please - I have an old Sansui AU-D7 amp and I would
like to connect a powered Radio Shack subwoofer to it. Problem is the amp has no subwoofer terminals. The subwoofer has both sets of low level and high level inputs. Which inputs should I use and do I simply connect them to the amp's speaker terminals? Can I use the amp's B vacant speaker B terminals, and just leave the speaker A terminals for the main speakers? Thanks for any guidance. |
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#2
Posted to rec.audio.tech
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Old Amp w/ No Subwoofer Terminal
"IndioBravo" wrote in message
ups.com... Newbie question please - I have an old Sansui AU-D7 amp and I would like to connect a powered Radio Shack subwoofer to it. Problem is the amp has no subwoofer terminals. The subwoofer has both sets of low level and high level inputs. Which inputs should I use and do I simply connect them to the amp's speaker terminals? Can I use the amp's B vacant speaker B terminals, and just leave the speaker A terminals for the main speakers? Thanks for any guidance. The first probolem you need to overcome is that the output of your Sansui is stereo, and the subwoofer is mono. You can do as you suggest, and hook it up to one of the B outputs, but then you will get the extreme bass from the left channel only. In practice this may not matter a lot as so much bass in pop music is mono in character anyway, but for non-pop music this will not work terribly well. What I would do is either:- A) If you're not using the tape outputs of the amplifier, then combine left and right tape out using a pair of 10kohm resistors, and take the resulting mono feed to the sub's low level input. if you are already using the tape output for tape or something else, then B) Combine the left and right B speaker outputs through a pair of 1k resistors and take the resulting mono feed to the sub's high-level input. I am assuming that the high level input presents a high impedance (say 1kohm) and that the only difference between high and low level inputs is the sensitivity. S. -- http://audiopages.googlepages.com |
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#3
Posted to rec.audio.tech
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Old Amp w/ No Subwoofer Terminal
"Serge Auckland" wrote in message news  "IndioBravo" wrote in message ups.com... Newbie question please - I have an old Sansui AU-D7 amp and I would like to connect a powered Radio Shack subwoofer to it. Problem is the amp has no subwoofer terminals. The subwoofer has both sets of low level and high level inputs. Which inputs should I use and do I simply connect them to the amp's speaker terminals? Can I use the amp's B vacant speaker B terminals, and just leave the speaker A terminals for the main speakers? Thanks for any guidance. The first probolem you need to overcome is that the output of your Sansui is stereo, and the subwoofer is mono. You can do as you suggest, and hook it up to one of the B outputs, but then you will get the extreme bass from the left channel only. In practice this may not matter a lot as so much bass in pop music is mono in character anyway, but for non-pop music this will not work terribly well. What I would do is either:- A) If you're not using the tape outputs of the amplifier, then combine left and right tape out using a pair of 10kohm resistors, and take the resulting mono feed to the sub's low level input. if you are already using the tape output for tape or something else, then B) Combine the left and right B speaker outputs through a pair of 1k resistors and take the resulting mono feed to the sub's high-level input. I am assuming that the high level input presents a high impedance (say 1kohm) and that the only difference between high and low level inputs is the sensitivity. S. -- http://audiopages.googlepages.com I disagree - subs I've seen which have "high-level" inputs connect to both the Left and Right - summing is done internally. Yes, the OP can connect the sub to the B speaker outputs - should work just fine, provided they simply parallel the A speakers, which I'm pretty sure would be the case on the Sansui. Mark Z. |
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#4
Posted to rec.audio.tech
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Old Amp w/ No Subwoofer Terminal
----------------------------------------------------------------------- "Serge Auckland" wrote in message news "IndioBravo" wrote in message ups.com... Newbie question please - I have an old Sansui AU-D7 amp and I would like to connect a powered Radio Shack subwoofer to it. Problem is the amp has no subwoofer terminals. The subwoofer has both sets of low level and high level inputs. Which inputs should I use and do I simply connect them to the amp's speaker terminals? Can I use the amp's B vacant speaker B terminals, and just leave the speaker A terminals for the main speakers? Thanks for any guidance. The first probolem you need to overcome is that the output of your Sansui is stereo, and the subwoofer is mono. You can do as you suggest, and hook it up to one of the B outputs, but then you will get the extreme bass from the left channel only. In practice this may not matter a lot as so much bass in pop music is mono in character anyway, but for non-pop music this will not work terribly well. What I would do is either:- A) If you're not using the tape outputs of the amplifier, then combine left and right tape out using a pair of 10kohm resistors, and take the resulting mono feed to the sub's low level input. if you are already using the tape output for tape or something else, then B) Combine the left and right B speaker outputs through a pair of 1k resistors and take the resulting mono feed to the sub's high-level input. I am assuming that the high level input presents a high impedance (say 1kohm) and that the only difference between high and low level inputs is the sensitivity. S. -- http://audiopages.googlepages.com With the tape out driving the subwoofer, the volume control of the receiver will not control the level of the subwoofer -- it will stay the same all the time as the main speakers are turned up and down. If the receiver happens to have a pre-out/main-in set of jumpers, there might be enough level there to Y-connect each of those to the powered sub. Worth a try. -- Regards from Virginia Beach, Earl Kiosterud www.smokeylake.com |
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#5
Posted to rec.audio.tech
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Old Amp w/ No Subwoofer Terminal
"Mark D. Zacharias" wrote in message
t... "Serge Auckland" wrote in message news "IndioBravo" wrote in message ups.com... Newbie question please - I have an old Sansui AU-D7 amp and I would like to connect a powered Radio Shack subwoofer to it. Problem is the amp has no subwoofer terminals. The subwoofer has both sets of low level and high level inputs. Which inputs should I use and do I simply connect them to the amp's speaker terminals? Can I use the amp's B vacant speaker B terminals, and just leave the speaker A terminals for the main speakers? Thanks for any guidance. The first probolem you need to overcome is that the output of your Sansui is stereo, and the subwoofer is mono. You can do as you suggest, and hook it up to one of the B outputs, but then you will get the extreme bass from the left channel only. In practice this may not matter a lot as so much bass in pop music is mono in character anyway, but for non-pop music this will not work terribly well. What I would do is either:- A) If you're not using the tape outputs of the amplifier, then combine left and right tape out using a pair of 10kohm resistors, and take the resulting mono feed to the sub's low level input. if you are already using the tape output for tape or something else, then B) Combine the left and right B speaker outputs through a pair of 1k resistors and take the resulting mono feed to the sub's high-level input. I am assuming that the high level input presents a high impedance (say 1kohm) and that the only difference between high and low level inputs is the sensitivity. S. -- http://audiopages.googlepages.com I disagree - subs I've seen which have "high-level" inputs connect to both the Left and Right - summing is done internally. If that's the case, then there's no problem. I haven't seen that myself. Yes, the OP can connect the sub to the B speaker outputs - should work just fine, provided they simply parallel the A speakers, which I'm pretty sure would be the case on the Sansui. Mark Z. Ditto if the L&R get summed in the subwoofer. S. -- http://audiopages.googlepages.com |
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#6
Posted to rec.audio.tech
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Old Amp w/ No Subwoofer Terminal
"Earl Kiosterud" wrote in message news:so4Vi.22715$eD3.8395@trnddc03... ----------------------------------------------------------------------- "Serge Auckland" wrote in message news "IndioBravo" wrote in message ups.com... Newbie question please - I have an old Sansui AU-D7 amp and I would like to connect a powered Radio Shack subwoofer to it. Problem is the amp has no subwoofer terminals. The subwoofer has both sets of low level and high level inputs. Which inputs should I use and do I simply connect them to the amp's speaker terminals? Can I use the amp's B vacant speaker B terminals, and just leave the speaker A terminals for the main speakers? Thanks for any guidance. The first probolem you need to overcome is that the output of your Sansui is stereo, and the subwoofer is mono. You can do as you suggest, and hook it up to one of the B outputs, but then you will get the extreme bass from the left channel only. In practice this may not matter a lot as so much bass in pop music is mono in character anyway, but for non-pop music this will not work terribly well. What I would do is either:- A) If you're not using the tape outputs of the amplifier, then combine left and right tape out using a pair of 10kohm resistors, and take the resulting mono feed to the sub's low level input. if you are already using the tape output for tape or something else, then B) Combine the left and right B speaker outputs through a pair of 1k resistors and take the resulting mono feed to the sub's high-level input. I am assuming that the high level input presents a high impedance (say 1kohm) and that the only difference between high and low level inputs is the sensitivity. S. -- http://audiopages.googlepages.com With the tape out driving the subwoofer, the volume control of the receiver will not control the level of the subwoofer -- it will stay the same all the time as the main speakers are turned up and down. That's right, silly of me to have missed that one. S. -- http://audiopages.googlepages.com |
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#7
Posted to rec.audio.tech
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Old Amp w/ No Subwoofer Terminal
Serge Auckland wrote:
With the tape out driving the subwoofer, the volume control of the receiver will not control the level of the subwoofer -- it will stay the same all the time as the main speakers are turned up and down. That's right, silly of me to have missed that one. Most amps have headphone outputs. S. Kind regards Peter Larsen |
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