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Longman Dictionary of Contemporary English
quadraphonic
adjective
EXAMPLES FROM CORPUS
▪ However, it was not possible to get any quadraphonic effect from the record, nomatterwhich system was tried.
▪ When it tells our brains which way our heads are pointing, it affects our perception of stereo and quadraphonic sound.
Douglas Harper's Etymology Dictionary
quadraphonic

1969, irregular formation from quadri- "four" + phonic, from Greek phone "sound, voice" (see fame (n.)). The goal was to reproduce front-to-back sound distribution in addition to side-to-side stereo. The later term for the same idea, surround sound, is preferable to this.

Wiktionary
quadraphonic

a. (context of a sound system English) Employing four independent channels or speakers.

WordNet
quadraphonic

adj. of or relating to quadraphony; "his quadraphonic sound system" [syn: quadriphonic, quadrasonic, quadrisonic]

Usage examples of "quadraphonic".

The walls were knotty pine with quadraphonic speakers embedded in them, there was an Armstrong suspended ceiling overhead, a large case filled with jigsaw puzzles and books, an electric train set, a slotcar racing set.