quadraphony

[ kwo-draf-uh-nee ]
/ kwɒˈdræf ə ni /

noun

high-fidelity sound reproduction involving signals transmitted through four different channels.
Also called quad·ra·phon·ics [kwod-ruh-fon-iks] /ˌkwɒd rəˈfɒn ɪks/, quadriphonics, quad·ra·son·ics [kwod-ruh-son-iks] /ˌkwɒd rəˈsɒn ɪks/, quadrisonics.

Origin of quadraphony

1965–70; quadra-, variant of quadri- + -phony