See more synonyms for quadraphonic on Thesaurus.com
  1. 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, quad·ra·son·ic [kwod-ruh-son-ik] /ˌkwɒd rəˈsɒn ɪk/.

Origin of quadraphonic

1965–70; quadra-, variant of quadri- + -phonic, as in stereophonic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for quadraphonic

quadrangle, quadrant, quadruplet, quadraphonic

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