• QuadraphonicQuad welcomes you and encourages your participation! Treat all members with respect. Please keep all discussions civil, even when you have a strong opinion on a particular topic.

    Do not offer for free, offer for sale, offer for trade, or request copies or files of copyrighted material - no matter how rare or unavailable to the public they might be. We do not condone the illegal sharing of music. There are many places on the internet where you can participate in such transactions, but QuadraphonicQuad is not one of them. We are here to encourage and support new multichannel releases from those companies that still provide them and as such the distribution of illegal copies of recordings is counter-productive to that effort. Any posts of this sort will be deleted without notification.

    Please try to avoid discussions that pit one format against another. Hint for new users: make liberal use of the search facilities here at QuadraphonicQuad. Our message base is an incredibly rich resource of detailed information on virtually all topics pertaining to surround-sound. You will be surprised at what you can find with a little digging!

QS vs. Synthesize in Sansui

Help Support QuadraphonicQuad:

gvl_guy

Active Member
Joined
Apr 23, 2019
Messages
83
Location
Greenville, SC
Does anyone know the difference between the QS mode and the QS Synthesizer Surround modes on the QRX series receivers? Just curious what is different. It definitely sounds different. (I never really use the "hall" position.)

I have a QRX-7001 and I'm REALLY impressed with the synthesize mode. Some albums that are "stereo" sound like they were made for quad!
 

JonUrban

Forum Curmudgeon
Staff member
Since 2002/2003
Joined
Mar 2, 2002
Messages
15,975
Location
Connecticut
QS mode is for QS encoded recordings - the decoder is optimized for these

buttons.jpg


QS Synthesizer Mode - this is what Sansui wanted you to use for stereo recordings when you wanted them to be heard in pseudo surround. IOW, any recording, tape or LP, that was not specifically encoded with QS. Some receivers had two variations on this "fake surround" as shown above, "HALL" mode was similar to a reverberation/ambient treatment, like you were listening in a church or large open area, and SURROUND which is more of a "this over there, that over here' type of deal.

Of course, there was nothing to prevent you from playing a stereo source in QS or SQ mode, in fact your results would always vary. Whatever sounds best to you is what you should use.
 
Last edited:

Sonik Wiz

1K Club - QQ Shooting Star
QQ Supporter
Joined
May 30, 2005
Messages
1,210
Location
Kansas City
But if you play a QS encoded recording through Synthesizer will it affect directionality/accuracy?
I certainly agree with Jon. If you play a QS record in the synth mode it will move what's intended for left (right) front speakers to center left (right). It will move center left (right) to the rear left/right chs. It will move left (right) rear to center back.
 

Sonik Wiz

1K Club - QQ Shooting Star
QQ Supporter
Joined
May 30, 2005
Messages
1,210
Location
Kansas City
Does anyone know the difference between the QS mode and the QS Synthesizer Surround modes on the QRX series receivers? Just curious what is different. It definitely sounds different. (I never really use the "hall" position.)

I have a QRX-7001 and I'm REALLY impressed with the synthesize mode. Some albums that are "stereo" sound like they were made for quad!
The QS Synth mode does a little opposite phase (more correctly "opposite polarity") blending of the two original input chs. Playing a stereo record in QS with a sound dynamically panned left to right, it will move from center left>center front>center right. In the QS Synth it creates a 270 deg horseshoe wrap around: Left back>center left>left front>center front>right front>center right>right back.
 

ar surround

1K Club - QQ Shooting Star
QQ Supporter
Joined
Apr 3, 2010
Messages
1,852
Location
New Joisey
The QS Synth mode does a little opposite phase (more correctly "opposite polarity") blending of the two original input chs. Playing a stereo record in QS with a sound dynamically panned left to right, it will move from center left>center front>center right. In the QS Synth it creates a 270 deg horseshoe wrap around: Left back>center left>left front>center front>right front>center right>right back.
Probably asked and answered a dozen times, but how does QS Synth mode compare to SM Involve if at all? IIRC there was chatter on one of the the SM threads that stated that they were not the same. (I believe that it was you, Wiz, who may have even asked for something like it in future incarnations of the SM?)
 

Sonik Wiz

1K Club - QQ Shooting Star
QQ Supporter
Joined
May 30, 2005
Messages
1,210
Location
Kansas City
Probably asked and answered a dozen times, but how does QS Synth mode compare to SM Involve if at all? IIRC there was chatter on one of the the SM threads that stated that they were not the same. (I believe that it was you, Wiz, who may have even asked for something like it in future incarnations of the SM?)
It is better to answer your question this way: The Involve SM is an updated highly sophisticated basic QS decoder ( allowing otherwise of course for the SQ mode). And I don't mean to degrade Involve by sayin "basic". It's just that it deosn't have any other additional Sansui QS enhancement modes. Play a QS record through a Sansui QS Variomatrix vs SM you should get the same sound localization in either one. If there is a difference I'd have to give the SM the edge as the correct reference.

Since the SM v1 or V2 doesn't have a Synth mode in the classical sense, I got around that by building my own front end for the SM. It allows me 4 stereo inputs, bass/treble, L/R balance and phase balance (variable synth) all by remote control.
 

jaybird100

1K Club - QQ Shooting Star
QQ Supporter
Joined
Apr 27, 2006
Messages
1,111
Location
Pembroke Pines, FL
It will be a bad decode. A QS source should always be played back through the QS circuits to hear what the original mix was intended to be heard.
When I had my QRX-6500, the only real difference I could hear between the QS and QS Synthesizer surround mode was a slight boost in the rear level. Hall mode reduced the level. But localizations, when playing QS recordings, were not affected.
 

fredblue

2K Club - QQ Super Nova
QQ Supporter
Joined
Mar 30, 2009
Messages
23,315
Location
London, England
It is better to answer your question this way: The Involve SM is an updated highly sophisticated basic QS decoder ( allowing otherwise of course for the SQ mode). And I don't mean to degrade Involve by sayin "basic". It's just that it deosn't have any other additional Sansui QS enhancement modes. Play a QS record through a Sansui QS Variomatrix vs SM you should get the same sound localization in either one. If there is a difference I'd have to give the SM the edge as the correct reference.

Since the SM v1 or V2 doesn't have a Synth mode in the classical sense, I got around that by building my own front end for the SM. It allows me 4 stereo inputs, bass/treble, L/R balance and phase balance (variable synth) all by remote control.
i thought (on the SMv1 at least) the 4.0 outs were for QS and the 5.1 outs were the Involve mode?

so the 5.1 Outs aren't doing anything different from the 4.0 Outs?
 

Sonik Wiz

1K Club - QQ Shooting Star
QQ Supporter
Joined
May 30, 2005
Messages
1,210
Location
Kansas City
i thought (on the SMv1 at least) the 4.0 outs were for QS and the 5.1 outs were the Involve mode?
Involve 4.1 = Sansui QS with the added subwoof.

so the 5.1 Outs aren't doing anything different from the 4.0 Outs?
In the 5.1 mode common mode (center front) material is removed from the front L/R c hs & funneled to the center front output. So yes using the cenetr front output makes quite a change. This processing is done after the basic Involve/QS decoding.
 

fredblue

2K Club - QQ Super Nova
QQ Supporter
Joined
Mar 30, 2009
Messages
23,315
Location
London, England
Involve 4.1 = Sansui QS with the added subwoof.


In the 5.1 mode common mode (center front) material is removed from the front L/R c hs & funneled to the center front output. So yes using the cenetr front output makes quite a change. This processing is done after the basic Involve/QS decoding.
ah great, thanks! 👍
so if i keep the 4.0 outputs hooked up (as they are now, always have been and forevermore shall be) i'll get all the QS loveliness the Sansui dudes intended back in the nineteenseventeeeesssss! 🥳 🕺🏾
 

Sonik Wiz

1K Club - QQ Shooting Star
QQ Supporter
Joined
May 30, 2005
Messages
1,210
Location
Kansas City
ah great, thanks! 👍
so if i keep the 4.0 outputs hooked up (as they are now, always have been and forevermore shall be) i'll get all the QS loveliness the Sansui dudes intended back in the nineteenseventeeeesssss! 🥳 🕺🏾
As David Lo Pan would say: INDEED!
And even better than original as several weak spots hvae been improved over available tech of the 70's.

Like DuncanS I always leave my .1 subwoof going too. I find a lot of material on Netflix doesn't have all that impressive surround sound even if it's being offered as 5.1. The SM is great for extracting some pizazz & I usually use the center front out with that.
 

fredblue

2K Club - QQ Super Nova
QQ Supporter
Joined
Mar 30, 2009
Messages
23,315
Location
London, England
As David Lo Pan would say: INDEED!
And even better than original as several weak spots hvae been improved over available tech of the 70's.

Like DuncanS I always leave my .1 subwoof going too. I find a lot of material on Netflix doesn't have all that impressive surround sound even if it's being offered as 5.1. The SM is great for extracting some pizazz & I usually use the center front out with that.
i'd use it for Netflix if only the SM could order me pizza to go with the pizazz..!! 😋🤩
 

DuncanS

2K Club - QQ Super Nova
QQ Supporter
Joined
Aug 30, 2012
Messages
4,855
Location
UK
As David Lo Pan would say: INDEED!
And even better than original as several weak spots hvae been improved over available tech of the 70's.

Like DuncanS I always leave my .1 subwoof going too. I find a lot of material on Netflix doesn't have all that impressive surround sound even if it's being offered as 5.1. The SM is great for extracting some pizazz & I usually use the center front out with that.
The .1 isn't connected on my system as I have 4 full sized floorstanders (Monitor Audio RS8) (+ a matching centre for 5) so plenty of Bass!
 
Top