A sound process in which the sound is sent to four (or five, I forget which) channels around the listener to provide surround sound. It has a fifth channel which is the subwoofer. I believe it is a predecessor to Dolby 5.1.

How to tell if a recording of a song is in quadrophonic:
Easy. The name usually has Quad Mix beside the name, or you could check the liner notes.

The exponent of this technology is holophonics.

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