![]() Then, as we know, the whole thing died a death." ![]() All the effects on ' Money' and other tracks were recorded on four-track, so they could be heard in true quad on the final record… But by the time the mix stage was upon us, quad hadn't really taken off as a medium in the way it was expected to, so it was a little bit of an anticlimax. Of Pink Floyd's The Dark Side of the Moon, engineer Alan Parsons recalled: "It was certainly the band's intention, when we recorded the album, to mix in quad. By the time that the most advanced logic system was introduced for SQ, the Tate Directional Enhancement System, by Martin Willcocks and Peter Scheiber, realized into the superb Tate II 101A decoder by Jim Fosgate, "quad" was already considered a failure. The SQ system also faced resistance from broadcasters since, while essentially a two-channel system and stereo-compatible, it could have substantial mono compatibility problems, which posed serious problems with all televisions and monophonic radios of the era. Early "Front-rear logic" circuits were introduced to enhance separation to 12 dB and later "Full logic" circuits 20 dB, but both provided poor performance, very noticeable gain-pumping and an unstable 'swaying' sound field. The early SQ decoders could not produce more than 3 dB of separation from front to back. In 4-2-4 matrix four channel stereo, the rear speakers should be of the same or almost same size quality and have the same or almost same frequency range as the front speakers. That is to say, the four channels produced at the final stage were not truly identical to those with which the process had begun. This 4:2:4 process could not be accomplished without some information loss. His basic formula used 90 degree phase shift circuitry to enable enhanced 4-2-4 matrix systems to be developed. The SQ encoding is based on the work by Peter Scheiber and further developed by Benjamin Bauer. These are then passed through a two-channel transmission medium (usually an LP record) before being decoded back to four channels and presented to four speakers. With matrix formats, the four sound channels (forward left, forward right, back left, back right) are converted (encoded) down to two channels (left, right). Record companies who adopted this format include: Angel, CTI, Columbia (internationally called CBS Records), EMI, Epic, Eurodisc, Harvest, HMV, Seraphim, Supraphon and Vanguard. Many recordings using this technology were released on LP during the 1970s. It was introduced by CBS Records (known in the United States and Canada as Columbia Records) in 1971. SQ Quadraphonic ("Stereo Quadraphonic") was a matrix 4-channel quadraphonic sound system for vinyl LP records.
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