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In Reply to: RE: SQ Quad posted by Tracy on March 12, 2017 at 18:41:08
because you say your dad's system had no decoder, he probably had a quad receiver that was probably a sansui, or marantz. SQ and QS were compatible matrix systems with only slight differences. it mattered not which matrix you used on either.
the system that WASN'T compatible and had to have a demodulating decoder was CD4 or Quadradisc. you could play the record on stereo but no matrix was used to encode it. there was a 30kHz carrier signal that when demodulated, gave DISCRETE four channel playback.
if you were listening to cd4, and the stylus got a dust bunny on it, the rear channels just went away, ther being no carrier signal to decode.
some of us went with the Dynaquad ambience retrieval system which extracted the out of phase material in SQ/QS or even stereo and put it in the back. it had an attenuator to bring the rear channel level down so it wasn't dominant. in fact, i would use a stereo recording and adjust the level so as to have the rears barely detectable. then when something that should be in back, it was plainly there. try any Tomita record.
so try a stereo recording with DPL and adjust the rears to near inaudibility, THEN listen to an SQ record.
on a positive note, Vanguard label recordings are many times in QS, even if they aren't touted as 4 channel. a bonus. they probably felt no reason to have a dual catalog. sensible.
SQ and QS are based on the dynaquad circuit only with logic steering of detected rear signals.
Still got my DynaQuad in use although I drive the rears with an ancient SS McIntosh amp with meters so there's plenty of gain if I need it. A friend of mine built this stand alone unit (doesn't look like a Quadaptor anymore) and it has a null/mono detente (push/pull knob) that allows me to properly balance the rears.
And you're right about Tomita! Even on CD. I think he did make some CD-4 LPs.
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