OK Quad guys! What's your receiver???

[DaveLaPorte53]

I have put my receiver away since I never use the tuner. I run a Pioneer CQ-800A preamp into my Marantz amp.

 

[jaybird100]

OK that is what I would expect with a stereo source in the discrete mode as there is no rear channel information to reproduce.

I'm looking at getting a 7001 or a 9001.

What I would to confirm is whether one can get a synthesised 4 channel effect with a stereo (non turntable) source. Looking at the online manual for the 9001 there is a QS synthesiser mode that would appear to do this. Is this correct? And if so, can the 7001 also do this?

Any stereo source can deliver a synthesized surround effect, regardless of source. The quality of the effect will be dependent on the particular recording. Some will be better than others. Both the 7001 and 9001 can do a very good job of synthesizing surround from stereo.

 

[kfbkfb]

A little OT...however...this is the most recent investigation of the UD-4 quad disc system:

https://pspatialaudio.com/matrix_h.htm

Kirk Bayne

 

[barfle]

Not sure if I posted here before, but the thread has been revived so here goes.

I only had one receiver in my life, a pioneer tube job that I bought with my E-4 pay back in 1968. Probably 35 WPC. I got an Altec 724 tuner/preamp with my employee discount in ‘73, and used the amp section of the pioneer until I was able to trade it for a 75 WPC Akai solid-state amp, which I still use for by back channels.

When I upgraded to a digital setup, I bought a Marantz 7701 pre/pro and Emotiva Stealth 8s for the front three channels. My back speakers are still Realistic Minimus 7s

 

[Zman]

Enough Blu-Ray, HD-DVD, SACD, DVD-A. How about some quad guys posting what they have for their receivers! Probably the pride and joy and center piece of a quad system, let's list what we have, and pictures are cool too. Especially if it's a rare unit.

Any all of you guys who never post because you have no reason to, comon, let us know what you're using. Amps and Receivers from the "quad era"!

I'll start:

I have a Sansui QRX-999, which is a European version of the QRX-9001 which I bought in Italy when I was in the Navy back in 1977. I carried that sucker up the fantail stairway on the aircraft carrier I was assigned to and it was heavy and awkward and I amost fell off the damn thing. But it was worth it! Still working today.

Technics SA-8500X but two pre-amp channels are fried. The just blew out this summer. Know where I can get replacements?

 

[par4ken]

Technics SA-8500X but two pre-amp channels are fried. The just blew out this summer. Know where I can get replacements?

The service manual can be found here.

https://www.hifiengine.com/manual_library/technics/sa-8500x.shtml
As for replacements, not sure what you need but check eBay for pieces from parted out units. I would look first into repairing the blown board. The CD-4 Demodulator/phono preamp uses the QSI-5022 which would be very hard to find.

Other than that I would suggest just using it as a Power Amplifier.

 

[jaybird100]

Technics SA-8500X but two pre-amp channels are fried. The just blew out this summer. Know where I can get replacements?

Denon AVR-3300, equipped with a Surround Master v.3.

 

[kfbkfb]

1989/1990/1991:
Due to Walmart selling some audio equip in the late 1980s/early 1990s, I bought 2 Pioneer SX-2300 stereo receivers.
(set up my 1st quad system with them in 1991: my home built matrix "decoder" + 4 Pioneer CS-G103 speakers)

2000:
(Best Buy) Pioneer VSX-D209

2004:
(Best Buy) Pioneer VSX-D514

2018:
(Amazon) Pioneer VSX-534

(currently using 1 SX-2300 and the VSX-D514 in surround sound configurations)


Kirk Bayne

 

[Dave P.]

Hi all! Here's my set up. I've got an excellent Sansui QRX9001receiver with a Rockville RPA12 amplifier and Victrola Pro Series turntable with a AT Shibata stylus. Right now I've got two Rockville RSG12 speakers and four decent speakers up top. I plan on getting two more RSG12's and stands for all four.

 

[amontass]

I have put my receiver away since I never use the tuner. I run a Pioneer CQ-800A preamp into my Marantz amp.

I use a fully restored Sansui QRX 7001 for QS and RM, a fully restored Lafayette LR 5000 for stereo, SQ, and CD4 (via a JVC 4DD5). I have a spare fully restored LR 5000 and 3 spare, still in the box, JVC 4DD5s.

Hi all! Here's my set up. I've got an excellent Sansui QRX9001receiver with a Rockville RPA12 amplifier and Victrola Pro Series turntable with a AT Shibata stylus. Right now I've got two Rockville RSG12 speakers and four decent speakers up top. I plan on getting two more RSG12's and stands for all four.

 

[Sal1950]

I have a spare fully restored LR 5000 and 3 spare, still in the box, JVC 4DD5s.

Now there's a man that's fully prepared.

 

[DudeRocks]

I use a fully restored Sansui QRX 7001 for QS and RM, a fully restored Lafayette LR 5000 for stereo, SQ, and CD4 (via a JVC 4DD5). I have a spare fully restored LR 5000 and 3 spare, still in the box, JVC 4DD5s.

I use a fully restored Sansui QRX 7001 for QS and RM, a fully restored Lafayette LR 5000 for stereo, SQ, and CD4 (via a JVC 4DD5). I have a spare fully restored LR 5000 and 3 spare, still in the box, JVC 4DD5s.

I too have the LR5000 and currently playing the new Rhino Quadio recordings stereo tracks through the RM to compare to the Blu-ray quad. It's sounds pretty close with Billion Dollar Babies Hello Hooray. I also have a Lafayette LR-64 with the composer a b circuits that on this forum is said to outperform Sansuis own QS! Well, I have an opportunity to pick up a QRX-6001 on the local marketplace. Looking to compare the RM in the Lafayette to the QS on your 7001, how do they compare? Is it noticable or just barely any difference? Wondering if it's worth the time and effort to essentially switch out a LR-5000 for a QRX-6001.

I'll add to this. I also have two LR-3000s that I rescued and need a little work. And another rescued Technics SA-8500x with bad amps but the CD4 circuitry works and also has a couple Matrix selections 1 RM and 2 whatever that might be.

 

[DudeRocks]

The service manual can be found here.

https://www.hifiengine.com/manual_library/technics/sa-8500x.shtml
As for replacements, not sure what you need but check eBay for pieces from parted out units. I would look first into repairing the blown board. The CD-4 Demodulator/phono preamp uses the QSI-5022 which would be very hard to find.

Other than that I would suggest just using it as a Power Amplifier.

Any chance you could get that manual for us? For the last several years going to that website. This is what I get when trying to register:

Account Registration​

Sorry, but due to abuse of our free service, the registration system has been disabled.

While we work on a solution to this issue, the service remains open for existing members only.

 

[par4ken]

Any chance you could get that manual for us? For the last several years going to that website. This is what I get when trying to register:

Account Registration​

Sorry, but due to abuse of our free service, the registration system has been disabled.

While we work on a solution to this issue, the service remains open for existing members only.

I don't think that I should post it here but PM me and I'll send it to you.

 

[gvl_guy]

I too have the LR5000 and currently playing the new Rhino Quadio recordings stereo tracks through the RM to compare to the Blu-ray quad. It's sounds pretty close with Billion Dollar Babies Hello Hooray. I also have a Lafayette LR-64 with the composer a b circuits that on this forum is said to outperform Sansuis own QS! Well, I have an opportunity to pick up a QRX-6001 on the local marketplace. Looking to compare the RM in the Lafayette to the QS on your 7001, how do they compare? Is it noticable or just barely any difference? Wondering if it's worth the time and effort to essentially switch out a LR-5000 for a QRX-6001.

I'll add to this. I also have two LR-3000s that I rescued and need a little work. And another rescued Technics SA-8500x with bad amps but the CD4 circuitry works and also has a couple Matrix selections 1 RM and 2 whatever that might be.

It's my understanding the Lafayette has the better SQ (full Logic) where the Sansui has QS Vario Matrix, better QS. I know my Sansui 9001 has spectacular fake quad in the synthesizer mode, although the blend resistors were removed by the QRX Restore. Separation is quite good.

 

[pakerney]

How's this for being a little bit off the beaten track? I own a Cambridge Audio CXR200 receiver. No Dolby Atmos, no room EQ, but it can calibrate speaker distances and levels. Ah, but the sound quality for any music source, type and resolution!!!

 

[DudeRocks]

It's my understanding the Lafayette has the better SQ (full Logic) where the Sansui has QS Vario Matrix, better QS. I know my Sansui 9001 has spectacular fake quad in the synthesizer mode, although the blend resistors were removed by the QRX Restore. Separation is quite good. All

Too bad there isn't a vintage audio museum setup where you could push a button for which receiver you want to listen to. It would help so much to actually be able to listen to the separation. I found a thread where people were hooking these up to their computer to back up their music, which is something I'm going to be doing eventually. They could see the audio waves on the computer and judge which was doing a better job at separation. I thought that was pretty cool. I'm pretty happy with my LR5000 but always interested to hear what the next brand can do better. It seems Lafayette had the best "wave matching full logic" for SQ, Sansui had vario Matrix for QS but I also keep reading the Lafayette Composer A/B circuit was actually better for QS and that makes me wonder what they did with that last models that replaced it with just 1 RM circuit. Was that RM any sort of vario matrix or a blah standard RM?

 

[par4ken]

Too bad there isn't a vintage audio museum setup where you could push a button for which receiver you want to listen to. It would help so much to actually be able to listen to the separation. I found a thread where people were hooking these up to their computer to back up their music, which is something I'm going to be doing eventually. They could see the audio waves on the computer and judge which was doing a better job at separation. I thought that was pretty cool. I'm pretty happy with my LR5000 but always interested to hear what the next brand can do better. It seems Lafayette had the best "wave matching full logic" for SQ, Sansui had vario Matrix for QS but I also keep reading the Lafayette Composer A/B circuit was actually better for QS and that makes me wonder what they did with that last models that replaced it with just 1 RM circuit. Was that RM any sort of vario matrix or a blah standard RM?

I don't know what you are reading but the Lafayette Composer A/B uses no "logic" or vario matrix circuitry. It is just a basic RM decoder, so it could not be better than Sansui (Vario-Matrix).

I forget the difference between Composer A and B, the manual is very cryptic as well giving almost the same description for both. It can be assumed that one setting would be best for QS/RM, the other for stereo and maybe EV-4 but the ultimate choice is left as a matter of taste, just use the one that sounds the best.

 

[DudeRocks]

I don't know what you are reading but the Lafayette Composer A/B uses no "logic" or vario matrix circuitry. It is just a basic RM decoder, so it could not be better than Sansui (Vario-Matrix).

I forget the difference between Composer A and B, the manual is very cryptic as well giving almost the same description for both. It can be assumed that one setting would be best for QS/RM, the other for stereo and maybe EV-4 but the ultimate choice is left as a matter of taste, just use the one that sounds the best.

It was this thread https://www.quadraphonicquad.com/forums/threads/lafayette-radio-and-quad.8902/ fourth paragraph down he mentions Composer A was accidentally the best QS decoder on the market.

The fifth paragraph down he mentions how they never offered the Composer A/B circuits on the 5000 in favor of only RM.

From reading his statements, sounds like their hand was forced to support RM.

Just out of curiosity do you know if RM had gone through any revisions in its life?

 

[par4ken]

It was this thread https://www.quadraphonicquad.com/forums/threads/lafayette-radio-and-quad.8902/ fourth paragraph down he mentions Composer A was accidentally the best QS decoder on the market.

The fifth paragraph down he mentions how they never offered the Composer A/B circuits on the 5000 in favor of only RM.

From reading his statements, sounds like their hand was forced to support RM.

Just out of curiosity do you know if RM had gone through any revisions in its life?

OK. I don't recall reading that thread before. The author emaidel used to sell Lafayette and so might be a bit biased, then again he puts down a lot of what Lafayette was selling back then. Sadly he hasn't posted since 2015, his posts are rather interesting! Anyway I have no doubt that the Composer produced a nice surround effect but to say that it was better than Sansui is very unlikely.

The early Sansui decoders were nothing special even with thier "phase modulation" circuitry however Vario Matrix is a whole different story!

So checking the schematic of the SQ-W the decoder functions are as follows;

Position 1 (Stereo) the input feeds through to the front and rear outputs, the rear outputs are reduced in level by about 7db.

Position 2 (Composer A) the input feeds the front (the same a pos 1), the rear outputs come off of a differential amplifier and feed the rear outputs. So it's an active version of Dynaquad.

Position 3 (Composer B) The outputs come out of the SQ logic circuit with the logic turned off. So it is just the "basic" version of SQ.

Position 4 (SQ) The outputs come from the logic circuit with the logic turned on the rear outputs attenuated a bit via a 47K resistor.

Position 5 (Discrete) The 4ch inputs pass through to the outputs attenuated by level matching resistors.

So no actual RM decoder is used and no form of logic enhancement but for full logic SQ.



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