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
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.