Quadraphonic records (LPs to you and me)

tatyana69

Ok but a proper decoder is what ...?

You'd need a decoder designed for the format you’re trying to decode, such as a JVC CD-4-50 for the CD-4 format. Or something like a Sansui QSD-1 for QS-encoded LPs.

Ok but a proper decoder is what ...?

@tatyana69 see the link below:

https://www.ebay.com/itm/Vintage-Sony-SQD-2070-SQ-Decoder-Tested-Works-Great/292327234714?hash=item4...

i used to have a 4 chanell setup back in the early 70's. cd-4 had the best separation. but you needed a cartridge to pick up signals up to like 40.000 hertz with a unit called a 'demodulater' i notice that today many cartridges can go up to 40,000 hertz. i don't know if any demodulaters are available today but that's how it was back then.

The demodulators are for the CD-4 LPs.

I remember all this stuff, but doubt I ever even heard a CD-4 record back in the day set up on a system to properly decode it; the SQ and QS formats had more market penetration, at least where I was in the NE in the early ’70s, but even those faded pretty quickly-
I gather there are people who like the effect of some of the matrixed (not discrete) mixes for two channel playback, never really bothered, though every once in a while an old record will come across my path where it is claimed to be ’quad mix’ (presumably SQ).
And in addition to the Shibata, CD-4 is what got us that lovely JVC vinyl compound for a while.