411 REFERENCE · Wiktionary
5.1
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
+ surround sound
Noun
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en attributive A six-channel surround sound audio system, having five full-bandwidth channels and one low-frequency effects channel.
en 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.