1) Fourchannel 2) Quadrasonic 3) Quadriphonic 4) Quadrisonic 1) Of or relating to quadraphony 2) Quadrasonic 3) Quadriphonic 4) Quadrisonic 5) Stereo 6) Stereo system 7) Stereophonic system 
produced by a sound system that employs four signal sources
[adj] - of or relating to quadraphony
quadraphonic, quadriphonic, quadraphonics Using a four-channel system to record and reproduce sound. The four separate signals may be fed to individual loudspeakers placed in the corners of a room.
quadriphonic adjective of or relating to quadraphony; `his quadraphonic sound system`
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.