quadraphonics in British English
or quadrophonics (ˌkwɒdrəˈfɒnɪks)
noun(functioning as singular) a system of sound recording and reproduction that uses four independent loudspeakers to give directional sources of sound. The speakers are fed by four separate amplified signals
Also called: quadrasonicsDerived forms
quadraphonic (ˌquadraˈphonic) or quadrophonic (ˌquadroˈphonic) adjective
quadraphony or quadrophony (kwɒdˈrɒfənɪ) noun