5.1

noun

(attributive) A six-channel surround sound audio system, having five full-bandwidth channels and one low-frequency effects channel.

The 5.1 earthquake shook the city.

意味（1）

(attributive) A six-channel surround sound audio system, having five full-bandwidth channels and one low-frequency effects channel.

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.