quadrophonic
adjective/ˌkwɒdrəˈfɒnɪk/
/ˌkwɑːdrəˈfɑːnɪk/
(also quadraphonic)
- (of a system of recording or broadcasting sound) coming from four different speakers at the same time
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quadrophonic
Definition of quadrophonic adjective from the Oxford Advanced Learner's Dictionary