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[kwod-ruh-fon-ik] /ˌkwɒd rəˈfɒn ɪk/
of, noting, or pertaining to the recording and reproduction of sound over four separate transmission or direct reproduction channels instead of the customary two of the stereo system:
a quadraphonic recording.
Also, four-channel, quadriphonic, quadrasonic
[kwod-ruh-son-ik] /ˌkwɒd rəˈsɒn ɪk/ (Show IPA)
Origin of quadraphonic
1965-70; quadra-, variant of quadri- + -phonic, as in stereophonic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Word Origin and History for 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.

Online Etymology Dictionary, © 2010 Douglas Harper
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