quadraphony

[kwo-draf-uh-nee] /kwɒˈdræf ə ni/
noun
1.
high-fidelity sound reproduction involving signals transmitted through four different channels.
Also called quadraphonics
[kwod-ruh-fon-iks] /ˌkwɒd rəˈfɒn ɪks/ (Show IPA),
quadriphonics, quadrasonics
[kwod-ruh-son-iks] /ˌkwɒd rəˈsɒn ɪks/ (Show IPA),
quadrisonics.
Origin
1965-70; quadra-, variant of quadri- + -phony