QS Regular Matrix

The system was based on technology created by Peter Scheiber, but further developed by engineer Ryosuke Ito[1][2] of Sansui in the early 1970s.

The technology was freely licensed and was adopted by many record labels including ABC, Advent, BluesWay, Candide, Command, Decca, Impulse, Longines, MCA, Passport, Pye, Turnabout and Vox.

As early as 1969 engineer and musician Peter Scheiber developed a matrix system very similar to QS.

In the early 1970s Sansui introduced the Four Channel Synthesizer Decoder QS-1[13] and the QSE-1 Encoder[14] based on the QS system in Japan and debuted export to the United States in March 1971.

Sansui's QS decoders also had good stereo-to-quad capabilities, wrapping the L-R panorama to LB-LF-RF-RB in a horseshoe topology.

The system was often incorrectly called RM (Regular Matrix) when used on amplifiers or receivers by other trademarks than Sansui.

[18] A five-channel system based on QS, named Quintaphonic Sound, was designed and built by John Mosely following his work on Sansui's Quadraphonic package and used for the 1975 film Tommy.

[19] The left and right 35mm magnetic soundtracks were QS encoded to create four channels around the cinema audience, while the centre mag track was assigned to the speaker behind the screen.