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Surround Sound is the term commonly used to describe a system in which the sound output appears to surround the listener that is, the technology gives the impression that sounds are coming from all possible directions.
In monophonic (mono) soundsystems, the signal sent to the soundsystem is encoded as one single stream of sound and the sound is usually received through a single speaker.
Surround sound is a term used to describe a type of audio output in which the sound appears to "surround the listener" by 360 degrees.