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nAlso called: quadrasonics
(Electronics) (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
ˌquadraˈphonic, ˌquadroˈphonic adj
quadraphony, quadrophony n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014