5.1
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English
Noun
5.1 (uncountable)
- (attributive) A six-channel surround sound audio system, having five full-bandwidth channels and one low-frequency effects channel.
- 2006, Ben Hardwidge, Building Extreme PCs: The Complete Guide to Computer Modding:
- Unless you have the space to set up a mini IMAX in your living room, your best bet is to get a decent 2.1 or 5.1 speaker set.