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Possible Answers: LPs.
Last seen on: Daily Celebrity Crossword – 6/5/18 TV Tuesday
Random information on the term “LPs”:
Quadraphonic (or Quadrophonic and sometimes Quadrasonic) sound – equivalent to what is now called 4.0 surround sound – uses four channels in which speakers are positioned at the four corners of the listening space, reproducing signals that are (wholly or in part) independent of one another. Quadraphonic audio was the earliest consumer product in surround sound and thousands of quadraphonic recordings were made during the 1970s.
It was a commercial failure due to many technical problems and format incompatibilities. Quadraphonic audio formats were more expensive to produce than standard two-channel stereo. Playback required additional speakers and specially designed decoders and amplifiers.
Quadraphonic audio reproduction on vinyl records was problematic. Some systems used a demodulator to decode discrete sound channels. This allowed for full channel separation, although such systems were prone to reduced record life. Other systems used matrix decoding to recover four channels from the two channels cut on the record. Matrix systems do not have full channel separation, and some information can be lost between the encoding and decoding processes. Both discrete and matrix quadrophonic recordings could be played in two channels on conventional stereo record players.