2.1 channel

Strictly speaking, 2.1 channel is not a home theater, but 2 channels can already constitute the simplest stereo. The sound is assigned to two independent channels during the recording process, thus achieving a good sound localization effect. This technology is particularly useful in music appreciation, and the audience can clearly distinguish the direction from which various instruments come, thus making the music more imaginative and closer to the on-the-spot experience. Where ".1" refers to the woofer, also known as the subwoofer, which is used to play the separated low-frequency sound and the LFE channel in Dolby surround.

4.1-channel

2-channel stereo can well represent the sound field in front of the listener, but it can't represent the sound field on the side and behind, so people add two speakers behind the listener, one on the left and one on the right, to form four channels, which constitutes the basic surround sound field. Where ".1" refers to the woofer, also known as the subwoofer, which is used to play the separated low-frequency sound and the LFE channel in Dolby surround. 4.1 channel can already represent the sound field well, and the listener can feel the sense of three-dimensional space. Four-channel surround defines four pronunciation points: front left, front right, rear left and rear right, and the listener is surrounded in the middle. The four-channel system can bring sound surround from many different directions to the audience, and can get the auditory feeling of being immersed in various different environments, giving users a brand-new experience.

5.1 channel

5.1 channel originated from 4.1 channel, and it added a center channel on the basis of 4.1 channel, which was placed in front of the listener to enhance the effect of dialogue. Among them, ".1" still refers to the woofer, also known as the subwoofer, which is used to play the separated low-frequency sound and the LFE channel in Dolby surround. 5.1 sound channel is a very good balance between cost and effect, which can establish a surround sound field and highlight the dialogue of the characters in the film. 5.1 channel is the most common audio form of home theater, which has been widely used in various home theaters. Some well-known audio recording formats, such as Dolby AC-3(Dolby Digital) and DTS, are all 5.1 channel systems. After that, 6.1 channels and 7.1 channels were all based on 5.1 channels. Many sound media were recorded with 5.1 channels when recording, and of course they should be played with 5.1 channels when playing.

6.1 and 7.1 channels

6.1 and 7.1 channels are very close. They are all based on 5.1 channels, and the left and right rear channels of 5.1 channels are placed on both sides of the listener, and one or two rear surround are added behind the listener. Among them, ".1" still refers to the woofer, also known as the subwoofer, which is used to play the separated low-frequency sound and the LFE channel in Dolby surround. Compared with 5.1 channels, 6.1 and 7.1 channels can get a more realistic effect of flying overhead or nearby, and have a more stable sound image to set off the movie atmosphere and music, so that both cinema and family appreciation have a more harmonious surround effect. Now more and more movies are recorded with 6.1 or 7.1 channels, so in the future, there will be more and more home theaters using 6.1 and 7.1 channels.

Generally speaking, the number of speakers in a home theater generally means that the home theater suite can support at most several channels. For example, if there are six speakers including the bass speaker, then 5.1 channels will be supported. Of course, in a few cases, there can be no woofer in the home theater, or the woofer and the front speaker can be made together, and there are also cases where one channel is played by multiple speakers. In addition, different channels are compatible. Of course, the 6.1 channel can play 2-channel stereo programs, and the 2.1 channel can also play 6.1-channel programs. Although the multi-channel surround effect cannot be achieved, it will not be impossible to play.

second question:

the power of the host is limited, the distortion rate is high when the sound is loud, and the output power of the power amplifier is large and stable, which can greatly improve the sound quality.

"channel" actually refers to the channel, but it doesn't mean that one channel has a speaker, because a frequency divider can be connected after the power amplifier, and a channel can be divided into high frequency (tweeter) and medium and low frequency (bass speaker).

the third question:

"y2369" on the third floor has been answered.

the fourth question:

I haven't heard of the effect of BMW, and I don't know. However, to enhance the effect, we must first look at whether the sound field layout is reasonable, especially the placement position of the high-pitched son. If the high-pitched son is placed in the A-pillar inverted mold, the sound field positioning will be much better; Then it's best to add a four-way amplifier and subwoofer, two-way push the front sound field, two-way bridge push the subwoofer (the role of subwoofer is not to blow up the machine, but to improve the sound field, "bass is the framework of sound"), and the host pushes the back field. This combination will definitely have a much better effect than if you use the host to push the front and back fields at the same time.

By the way, the answer to the first question was found online.

if you think the answer is ok, please give me the best one.