Longman Dictionary of Contemporary English homepage

surround-sound

 noun
     
surround-sound , surround sound [uncountable]
a system of four or more speakers (=pieces of equipment that sound comes out of) used so that sounds from a film or television programme come from all directions
—surround-sound adjective [only before noun]
surround-sound speakers
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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