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Hello herd. How are you folks doing? Grooving on the groovy quad tunes? For a quad format that died out so long ago it is impressive how many folks still enjoy using that now nearly ancient equipment to make a far-out sound-field for audio enjoyment. It is helpful that the matrix quad decoders can create a surround sound by synthesizing a stereo input.

To assist this blog in sharing information about quad I created a Pinterest page showing pictures related to quad. Taken from many different sites the pics can act as a link to sites where the pic is located and that may have other pics and written information you find interesting.

Click on the link below and check it out. It’s groovy!!!

Quadraphonic Surround of the 1970s

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QS aka RM

QUADRAPHONIC STEREO

Sansui introduced the QS quad encode/decode system in February 1972. Similar to SQ and EV-4, QS can decode any matrix-type quad encoded record along with synthesizing quad from a stereo source. Often, QS is shown on quad equipment with the designation “RM.” This stands for Regular Matrix. Supposedly, RM is the QS type without logic in the decoder.

I think Sansui’s grooviest invention was the famous Vario-Matrix circuitry. Various audio magazines described this circuitry in a most confusing manner. Some described Vario-Matrix as a “logic circuit” that improves channel separation. Another writer said it was specifically designed to synthesize a stereo source into a quadraphonic output. Whatever it was intended to do, it sure does sound good. Almost everything I play; FM, Compact Discs, records, whether it’s a quad or stereo version, is passed through my Vario-Matrix circuitry. Stereo sounds dull, lifeless, and boring compared to the sound of my quad receiver pumping out the tunes through its Vario-Matrix decoder.

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