7.1 Channel

7.1 声道 refers to seven main channels plus one LFE channel. In a typical home theater setup, the front channels are left, center, and right; the left and right surround channels are positioned on either side of the listener; and the left and right rear surround channels are positioned behind the listener. This configuration subdivides the 5.1 surround sound area into two pairs of discrete channels: the side and rear channels.

There is not a single globally standardized channel order for “7.1.” Historically, the SDDS cinema layout added left-center and right-center channels to the front, while the rear configuration differed from that of home 7.1 systems; files, interfaces, and codecs may also use different channel arrangements. When exchanging data, you must follow the format mapping and cannot connect the wires directly based on the channel numbers in the file.

Blu-ray can carry discrete 7.1 audio via LPCM, Dolby TrueHD, DTS-HD Master Audio, and other formats, while some 5.1 content is upmixed by the receiver to seven main speakers. Increasing the number of speakers in the upmixed output does not convert the source to native 7.1.

Notations such as 7.1.2 and 7.1.4 add height or overhead channels beyond the 7.1 horizontal plane; omitting the third digit does not preserve the same meaning. The actual number of subwoofers is determined by bass management and is not limited by the `.1` suffix.