I am puzzled by what you say here, Sonik.
The Involve SM natively uses straight QS mode(with high seperation just like Variomatrix), a hard panned sound from a stereo source will emanate from between front and rear of the given set of side speakers.
Well said @furui_suterioo . To elaborate a little, Sansui had two modes dedicated to stereo playback the Hall mode and Surround mode. The latter gives the wrap around effect. All it takes is a little opposite phase blending between the stereo chs before decoding. Proper speaker set up only presents what the decoder is doing, but what I'm talking about actually changing the decoded output.
I have NEVER heard any form of Dolby decoding that sounded any good on music. I suspect that is why most people use their surround systems for movies while listening to stereo for music.
The more discreteness, the less wrap-around.
I was surprised that Sansui left the front channels undecoded in the Hall mode. Sonic your original Pre-synth circuit being fully adjustable was able to apply in phase or out of phase blend to the QS decoder making Hall/QS/Surround switching unnecessary. In phase produces the Hall effect by focusing more sound to the front. In doing so some out of phase ambiance is also removed. Hall effect as implemented by Sansui is only half decoded!
Me thinks you mean opposite phase blending? Yes I do read your posts closely...
That is really quite amazing. I've never seen that before.
I looked into this before but forget the exact details. I once assumed that the switch might bypass the allpass phase filters in the synthesizer mode, but it does not. I suspect that Synthesizer Surround and Hall function the same to that of other units. My QA-7000 Amplifier has the same switching configuration. According to this QS surround is normal (square four corner) QS, not sure if they still bypass the fronts in QS Hall mode? Information here.
The Surround Master does a better job with actual Dolby Surround-encoded music than any any PL II system I've heard, too.
I must agree!
All QRX receivers have Vario-Matrix, although the X001 series models, such as the 7001, have more advanced versions. the 9001 has the best version of Vario-Matrix.
Also the QSD-1, QSD-2, and QSD-1000. The D-2 is the same decoder as QRX receivers. The D-1 is tri-band and the D-1000 is single band but newer design(the rarest of them). There are also a couple of prototypes but I don't recall the model numbers.
And, like the QSD-1, the Surround Master is a tri-band decoder. I'm not sure if any decoder before it employed tri-band for SQ as well, that actually made it into consumers' hands. Also, unlike most Tate System SQ decoders, there are no "pumping" effects with the SM.
There is no pumping with the S&IC! Even anomalies from the unit with the older National chips are eliminated by backing off the Separation control a bit. With the unit that uses the Exar chips anomalies are confined to the back channels and are only really audible when listening to them in isolation. I would not call it pumping. Pumping is only an issue with logic type SQ decoders, when adjusted properly pumping is not noticable.
The pumping effect has been discussed in these forums before. Let's just say the SM does at least as well as the Tate, for a lot less money, plus is also does QS. The Tate doesn't do that.
Actually you can decode QS with the Composer. You use the Stereo Enhance mode and set the stereo enhance control midway. Everything with the exception of full centre (which skews to the right back) decodes properly. Only in recent times (20 years maybe) did I own a real QS decoder. Prior to that everything went through the Composer!
