5.1 channel refers to a surround sound system, where "5" refers to five 3-20,000Hz full-range speakers, ".1" refers to a 3-120Hz subwoofer, and the entire The system includes two front channels, two rear channels, a center channel and a subwoofer channel. Among various sound field decoding and sound field technologies, the most common, or most standard, is 5.1 channel output, such as Dolby 5.1, DTS5.1, THX5.1, etc. Other standard decoding methods can also pass 5.1 very well. audio channel output. The 5.1 channel output includes center channel, front main left/right channel, rear left/right surround channel, and so-called "0.1" subwoofer channel. A total of at least 6 speakers can be connected.