Sony SQD-2020
(1972 - 1976)
Sony SQD-2000
(1970 - 1972)

The Quad debacle made good at least on one account: it forced the LP industry to heighten its technical standards so that LPs could contain enough coded phase-shifts to feed the Quad decoders and receivers.

The result was that regular 2 channel LPs bloomed with even more magnificence, a depth which some say we did lose with subsequent digitalia...

An evolution of the earlier SQD-2000 [?], the 2020 was, according to Sony's politics, strictly SQ oriented: SQ reel-to-reel, SQ LPs, SQ Radio broadcasts (oops, sorry: that one never made it either).

Sure, but it could handle QS coded sound. Or any other source as it were: spread a 2-channel source onto four channels or decode the QS coded sources by way of its R-Matrix mode or even be used in mono.

Mono, MONO ? Monophony over 2 speakers ? Spread over 4 ? But it ain't mono anymore !
Go figure :-)