the concept of multi-channel music is relative to that of two-channel music.
In fact, two-channel and multi-channel are derived from the pursuit of stereo effect by electroacoustic scientists. In the early days, two channels (left and right channels to simulate human ears) were used to create stereo effects. But the effect was not ideal, so later, multi-channels were developed, such as the common p>5.1-channel, 6.1-channel and even the more powerful 7.1-channel. It is said that now there is a powerful 8.2-channel amplifier, which is called 1-channel amplifier, and we will talk about it in detail later.
(PS: Let me explain the conceptual difference between two channels and stereo. Two channels is a kind of stereo, but stereo includes two channels, four channels, five channels, six channels and seven channels. But now people have confused these two concepts. Stereo, which they often come into contact with, refers to two-channel sound. < P > Stereo music on the p>5.1 music network is also two-channel. )
5.1-channel system, which outputs sound in five directions: left (L), middle (C), right (R), left rear (LS) and right rear (RS). The five channels are independent of each other, and the ".1" channel is a specially designed subwoofer with six speakers. It is precisely because there are speakers in the front, back, left and right that there will be a sense of reality surrounded by music.
due to the different sound processing systems produced by major companies, they are divided into Dolby 5.1, DTS5.1 and THX5.1, all of which are output through 5.1 channels.
6.1 channel system is an extended surround audio format, which adds a rear center on the basis of 5.1 in order to make the left and right surround sound connect better, such as Dolby EX and DTTES.
7.1 channel refers to the TH Surround EX system. The 6.1 channel is basically optimized to be two-way rear center, so as to prevent the listener from hearing the sound field deviation caused by not sitting in the emperor's seat, and once again strengthen the sense of first-line sound effect encirclement. It can be seen that TH Surround EX (i.e. 7.1 channels) system is not an audio recording format, it just makes its surround sound better.
8.2-channel amplifier first appeared in YAMAHA's DSP-AX1 AV amplifier, which is called 1-channel amplifier. It is to enhance the effect of surround sound field. On the basis of 6.1 channels of Dolby EX and DTTESS, YAMAHA's exclusive front surround channel (the loudspeaker box is placed at the back and upper part of the main channel) is added, and a subwoofer output is added. The rear middle surround sound is also expanded from one channel to two channels (similar to 7.1 channels), which constitutes YAMAHA's exclusive 8.2 surround sound.
At present, 5.1 channel is mainly used for music audition, 7.1 channel is mainly used for movie video, and 8.2 channel is rare.
when choosing a sound channel system, you need to combine your own needs.