What is 7.1 channel
The author first explains why there is a 7.1 channel such a surround format. In fact, in the multi-channel surround format, there are currently four major camps in the world: SACD 5.1, DVD Audio 5.1, DTS ES 6.1 and Dolby Digital EX 6.1. SACD and DVD Audio are currently used in audio-based software, and the film does not use both formats, while DTS ES 6.1 and Dolby Digital EX 6.1 are surround formats for movies. However, since the movie format is a 6.1 channel instead of a 7.1 track, what about 7.1 channels?
Please note that in our digital sound effect, in addition to decoding DTS and Dolby Digital, there is also a DSP (Digital Surround Processing) sound field processing mode. After the AV amplifier is used to decode the DTS or Dolby Digital audio format, the DSP processing mode is usually added to make the sound field, sound, etc. closer to the effect of the large theater. At this time, the high-end AV amplifier will be The 6.1-channel audio track is converted to 7.1 channels by a digital sound field processing program. So for the surround format of DTS 5.1 and Dolby Digital 5.1, can the DSP convert it to 7.1 channels? The answer is yes.
The 7.1-channel DSP processing mode is available in some high-end AV amplifiers, such as the Denon 3802 and 3803AV amplifiers. The higher-priced Denon A11SR, A1SR and Onkyo DS989 are also equipped with the most advanced THX Ultra 2 DSP mode in the United States. In fact, many AV amplifiers are equipped with at least 6.1 channels even if they do not have 7.1 channels. So what is the difference between 7.1 and 6.1? The 7.1 channel uses a pair of surround speakers to replace the 6.1 channel. This has many advantages. It is definitely not as if there is only one speaker. You need to know the left side of the person's ear, the one on the right, and there is no ear behind your head. If there is only one surround speaker behind you, the audio will be biased. This deviation will cause you to feel that the sound is relatively close to the left. Because your left ear receives the sound first, sometimes you feel the sound is on the right side, and the sound image does not have a three-dimensional effect, almost a flat sound, which sounds like something is wrong. The unchanging truth is that when your ears are not facing the sounding point, you need two speakers to correct the phase difference. This is why you should use at least two speakers (stereo) to listen to music. Therefore, the sound field and phase that can be created with two surround speakers are more advanced configurations in the home theater field. What is a THX home theater?
Let's talk about THX briefly. THX is a home theater specification developed by Lucas Film of the United States, which is divided into civilian and professional use. The professional theater is THX MP3, the civilian is divided into two grades, the highest grade is THX Ultra 2, followed by THX Select. THX is the world's first home theater technology. Lucas Film's three-episode Star Wars, which was filmed more than two decades ago, has accumulated a wealth of digital technologies. It has ported these digital technologies for large theaters to home theaters, and established the THX division to promote THX DSP technology. , THX speaker specifications and so on. Until today, THX has grown into an independent company. The DSP technologies we see on the market today, such as Yamaha Cinema and Sony DCS, are also developed based on the concept of THX. We see Hi-End home theater amplifiers in the civilian market, all equipped with THX DSP, some of the Japanese AV amplifiers are also equipped with THX, such as Tianlong and Onkyo AV amplifiers.
THX is the earliest 7.1-channel DSP mode in the multi-channel field. In fact, the complete THX is a set of home theater technical specifications, which allows us to have a benchmark when building our own theater. He not only has a DSP sound field. Processing, as well as space processing, speaker specifications, video specifications, and so on. Welcome to Home Theater Network
How to position 7.1 channel?
Is the 7.1-channel placement complicated? It's actually very simple. As we talked about before, the correct placement of the speakers has a huge impact on the sound, and these effects will have a critical decision on the clarity of the sound, the location of the sound source and the consistency of the audiovisual. The biggest difference between the 7.1-channel speaker placement is the position of the four surround speakers. Here I provide a calculation formula to calculate the position of the four surround speakers. Please note that this is based on the best position in your space. It is not calculated from the position you are sitting in. You should first place the speaker in these positions and then choose where you are sitting.
Schematic + explain how the 7.1 channel system is placed?
â–² one position
L speaker placement <br> Distance from Y axis = X axis length x 0.18
Distance to the X axis = Y axis length x 0.15
<br> placement of the Y-axis of the horn from C = (X-axis length x 0.18) / 2
Distance to the X axis = Y axis/2
R speaker placement <br> Distance from Y axis = X axis length x 0.18
Distance to the X axis = Y axis - (Y axis length x 0.15)
SL speaker placement
Distance from the Y axis = length of the X axis x 0.535
Distance to the ground = Z axis x 0.75
Note: This position must use two-way or one-way sound surround speakers, three-way sound speakers are not applicable.
SR speaker placement <br> Distance from Y axis = X axis length x 0.535
Distance to the ground = Z axis x 0.75
Note: This position must use two-way or one-way sound surround speakers, three-way sound speakers are not applicable.
SB speaker placement
The distance between the two SB horns is 30cm, and the distance from the ground based on the Y-axis/2 = Z-axis x 0.75
Note: This position must use two-way or one-way sound surround speakers, three-way sound speakers are not applicable.
LFE subwoofer placement
Distance between subwoofer and X-axis (left or right wall) = Y-axis length x 0.039
Distance from the Y axis = length of the X axis x 0.738
Emperor listening position <br> Distance to Y axis = X axis length x 0.535
Distance from the X axis = Y axis length / 2
Note: The origin is the center of the room.
The above is the 7.1-channel placement calculation. This result can provide an acoustic-aligned position reference in different spatial directions. After the horn is placed in position, it can be adjusted according to the actual sense of hearing, because our space is impossible. There is no furniture, and sometimes because of the placement of furniture, it may be necessary to sacrifice the best position of the horn.
â–²7.1 channel system positioning diagram
Speaker placement is only a foundation in the multi-channel field. It is also a simple matter for everyone in DIY. Once the position is correct, the whole system can at least exert a certain strength. The speaker position and tone are not absolute. The relationship, but has a great influence on the sound field, positioning, and density of the sound. The tone style is already set when you select the equipment. If you can make some efforts on the space acoustic treatment under a good position, you can really enjoy the power like a cinema.
Compabile Models:
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For LG Nexus 4, For LG Nexus 5, For LG G Pro, For LG D1L, For LG LTE2
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For Others:
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