Compared with ordinary stereo, what are the advantages and disadvantages of surround sound? This will start from the stereo recording. Strictly speaking, stereo recording has high requirements on the angle of the microphone. It is generally required that the sound directly entering the microphone and the sound reflected back through the room should reach an appropriate ratio, so that the recorded sound will have a strong sense of space.
In the actual stereo recording, it is difficult to achieve a proper ratio of the sound directly into the microphone and the sound reflected back through the room. The main problem is that in the later mixing, various signals are mixed together. In fact, various sounds are mixed after entering the ear canal. In stereo recording, the most easily lost is the sound reflected back through the room, and it just determines the spatial sense of the sound. Therefore, when people study surround sound, they decide to set up rear channels to compensate for these mixes. In this way, during the recording process, more microphones need to be added, which means that more speakers are needed to restore the sound during playback, which involves the placement of multi-channel speakers.
5.1 Placement of speakers
The placement of multi-channel speakers is directly related to listening quality. Even a little difference will cause a great change in the sound field. Because the desktop theater is a near-field listening, it is not very sensitive to the shape and volume of the space, as well as the diffraction and absorption of furniture and other objects, and the speaker placement is relatively free.
â— Placement of front speakers
The front left and right main channel speakers are placed in an isosceles triangle shape (Figure 1), and the bottom side is 1.5m to 2.0m long. If the two front speakers are too close to each other, what the human ear hears is only the direct sound field effect of the speaker, and the rendering effect of the reflection passing through the wall and surrounding space is not heard. The sound is inevitably dry and mixed. Even if it is reflected by the wall, because you are too close to the sound field, the diffracted sound is also covered, which is difficult for you to hear. In general, the two main speakers are best at an angle of 45 ° to the listener. If the speakers are too close to the listener, the sound range positioning is inaccurate, and the high and low units have a phase difference, and the sound is not synchronized; the distance is too far. The field will become narrower, losing the sense of space and presence.
figure 1
â— Placement of the center speaker
There is only one principle for the placement of the center speaker-it must be placed directly in front, that is, the vertical bisector of the left and right speakers, in the same plane as the left and right channel boxes, generally placed above the display (Figure 2).
figure 2
â— Placement of rear surround speakers
Rear left and right surround speakers should be placed on the rear wall on both sides. If possible, use the speaker stand to frame the surround box as high as possible with the left and right main speakers. The arrangement is also based on the isosceles triangle arrangement, the distance between the bottom and the main speakers is equal or slightly longer. The rear speaker should be placed at an angle of 110 °. The reason for this placement is that the angle of the human ear is approximately 110 °, and the rear speaker mainly plays back the sound from the back, so the placement of 110 ° is closer to the real Effect. For many computer players, the space behind is limited, and it is unlikely to be used for rear speakers. Even if there is space, whether it can be placed at exactly 110 ° is a big problem. To this end, you can use the following "compromise" program-
Option 1: For those with no rear space, the rear speakers can be “reversed†to the front, that is, placed in mirror symmetry between the front and the original rear position.
Option 2: If there is rear space but cannot be placed at 110 °, it can be placed at a position behind without following the 110 ° specification.
Option 3: If the rear speakers cannot be on the same plane, the height of the rear surround speakers can be about 60 ~ 90 cm higher than that of the listener. But try to avoid situations where the height is below the human ear.
â— Placement of the subwoofer
The placement of the subwoofer needs to be emphasized. First of all, the directionality of the bass is relatively weak, so the placement of the subwoofer can be irrespective of the position, but it can be randomly placed regardless of the position. Generally speaking, when the subwoofer is placed close to the wall, it will have a more average bass performance. It is recommended to place the subwoofer in the center of the desktop with the box facing backwards, the effect will be better. Because the bass will reach the human ear after two reflections, this will make people feel that the sound field is stretched, and the sense of presence is stronger. 5.1 The overall effect of speaker placement is shown in Figure 3.
image 3
6.1 Placement of speakers
Compared with the 5.1 sound system, the 6.1 sound system has an additional rear center speaker. The speaker placement requirements are the same as the center speaker. Therefore, the placement of 6.1 speakers is relatively simple, which is to add a rear center speaker based on the placement method of 5.1 sound system. It should be noted that due to the addition of the rear center speaker, the rear sound is enhanced. Therefore, the random placement of the rear speakers of the 6.1 sound system will not affect the effect too much, so the effects of various "compromise" schemes have been strengthened and are closer to the ideal scheme. This is also the biggest advantage of the 6.1 sound system over the 5.1 sound system. Too.
7.1 Placement of speakers
Compared with the 5.1 sound system, the 7.1 sound system adds two side center speakers while retaining the original rear speakers, mainly responsible for the playback of side sounds, and the original rear speakers can focus more on the playback of the rear sound, so 7.1 The sound system can achieve sound playback on all four sides, and the surround effect is further enhanced.
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