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I have a Sansui AU-555A integrated amp and TU-666 tuner in my office system. I have 2 Dynaco A-25s and 2 Dynaco A-10s which I have on the speaker 1 and 2 outputs depending upon where I am working. It is also hooked up to my computer via a Yamaha DP-U50 DSP.
SO... I picked up a matching Sansui QS-1 quad synthesizer to play with. I originally thought it included an amplifier for the rear speakers but it does not. It has low and high level outputs which are RCA Jacks. I assume the low level outputs are connection to the pre-amp inputs of an integrated amplifier like my AU-555A, but what about the high level outputs? Also Does anyone know if Sansui made a rear two channel amplifier for adding the QS-1 to an existing system? It seems overkill to get another AU-555A to act as the rear channel amplifier. The QS-1 and AU-555A seem to be a perfect match.
Follow Ups:
They sure did make one, because I've got one! It matches your system beautifully. I'm open to trades if you have suggestions. Send me your email and I can provide pics. Cheers. Yama.
It looks like you will need another amp. Perhaps the high level outputs will allow you to uget by with just a power amp. You will not need as much power for the rear channels as you have for the front. You could pick up a cheap to allow you to try out QS quadraphonic sound. I remember all the fuss about the different quad matrix formats in the 70's, but there really is very little difference between them and first generations of Dolby surround. I know of people who use quad for surround sound.
I have been wanting to try out a higher quality T-amp (15-20 Watts) and they are so small that I could make a matching case and face plate that would stack next to the tuner and make it the same width as the AU-555A and QS-1. It should be good enough to drive the A-10's. I think their efficiency is reasonably high.
Dave
I have one with the user manual. It does not has any built-in amplifier at all. You need two stereo power amplifiers to create that pseudo 4-channels effect ( one front and one rear ). The unit has several pre-set sound effects to fix your need. Mine is still in the drawer. I still have not try it since I bought it new. Good Luck.
Mike
that's about it for functionality. Sansui promoted the QS encode/decode system (as opposed to SQ and CD-4) which was much like SQ in that it was a matrixed synthesis of 4 channels into 2 channels.
What's interesting about this one is that there's no mention of QS that I can see. In that case, that would make this dematrix unit an early implementation.
Most of the players in the 4-channel craze in the 70s marketed all sorts of add-on devices to retrofit 2 channel systems into 4-channel. This model seems to attempt to replace all the controls you had to dink around with by replicating them in one box. Nice idea but most, indeed, did also supply the additional 2 power amp channels.
I've posted here before about why 4-channel died a merciful death mostly due to the complexity of operating the darn things.
Cheers,
David
Put on your boots, from a Sansui brochure:
"Here it is, Sansui's history making 4-channel synthesizer Decoder QS-1., the ingenious yet inexpensive Sansui instrument that magically transforms two channel stereo signals into a breathtaking live sound field. An extraordinary stereo achievement, the QS-1 is having a profound impact on the entire world of stereo in two ways. First it permits stereo enthusiasts to continue to use and enjoy their present 2-channel stereo equipment and program sources while moving into the new audio era. And secondly, it is obviating the need for 4-channel sources per se because, as distinguished audio technicians have attested, the QS-1 actually surpasses any 4-channel devices yet developed in terms of sound field brilliance. This remarkable reproduction is accomplished through the use of an exclusive new decoding matrix which establishes more distinct images of original sound sources than ever before, and through a technique called "phase modulation" by which direct and indirect sound waves are fused to precisely duplicate the way they would be heard in a concert hall surroundings. In addition, the QS-1 so dramatically improves the smoothness and dynamic range of reproduced sound that even compact speaker systems can render sound as life-like and powerful as that heard from much larger systems. With the QS-1, the age of the multi-dimensional sound field has arrived. Styled to match the elegance of other distinguished Sansui components, it can nontheless be incorporated in any quality stereo system. And for a very modest investment, the new audio age is yours to enjoy."
Wow, I NEED one of these! audio nirvana awaits.... now how do I hook it up?
Here is a blurry picture of the rear.
Here are the guts. I do not see an amplifier.
I know that Sansui made quad adapters that included rear channel amplifiers. I have never heard of one that lacked an amp for the rear channels. Given that it is hard to think of another use for the high level outputs you referred to, I would guess that you have RCA connectors for speaker outputs. Such was not uncommon back in the 70's. I would at least try to connect those outputs to speakers before buying another amp. Radio Shack sells speaker wire with RCA plugs.
according to this site, anyway
pax vobis
I will give it a try but it still does not make sense to me. Why would it have high level FRONT outputs? I assume that you feed it low level inputs from the pre-outs from the main amp, it synthesizes the 2-channel signal to 4-channel and then you feed the low-level outputs back into the amplifier. If the QS-1 had an internal amp for the rears then you could use the high outs to the rear speakers.
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