A surround sound system that uses four independent audio channels to create spatial sound reproduction. When playing quadraphonic audio, sound is distributed across four speakers – typically front left, front right, rear left, and rear right – to create a three-dimensional listening experience. Quadraphonic sound was popular in the 1970s but has mostly been replaced by modern multichannel systems like 5.1 and 7.1 surround sound.
Quadraphonic sound
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