The audio-visual effect of the home theater audio-visual room can be said to depend on the equipment, and the other half depends on the overall acoustic environment. Today we will talk about the basics of home theater audio and video room decoration: The walls of the home theater audio-visual room are generally decorated with the principle that the front wall is hard and the side wall is diffused. Pay special attention to the space in the listening space. Do not use thin plates to nail the cavity wall or separate the space. Because the thickness of the thin wood is 0.5cm~3cm, the thickness of 3cm or more is rare. The frequency of the 3cm plate is quite high at 125Hz, and there is 0.28 absorption rate. The higher the frequency, the lower the sound absorption rate. The thinner the board, the lower the sound absorption at 125 Hz, but the higher the sound absorption at 250 Hz. In the home decoration, the 2cm board is used to separate the room, and there is a cavity behind the board. The cavity will increase the sound absorption rate, which makes the middle and low frequency less sense and the sound is thinner. A. The left and right side walls are the first reflection of the sound from the speaker. The first reflection must be made into a sound-absorbing process. After this processing, it will help the clarity and sound of the sound image. Clean, not to make the sound loud. The method is to set some sound absorbing materials on the side wall between the speaker and the listening position. As shown in Fig. 2, the sound absorbing area should have a height of 1-1.5m wide and about 2m. The sound absorbing material can be creased with a thick velvet cloth like a curtain. It can be naturally hung on the side wall. It can also be wrapped with cotton cloth to make the sound cotton, and the sound absorbing body made of a piece can be fixed on the wall or the wool blanket can be hung. If the left and right side walls are sound-absorbing, the sound image positioning becomes precise and the sound is not noisy. The back wall of the speaker (that is, the front wall facing the listener) can be left untreated. On the contrary, it is necessary to do some sound absorption on the back wall of the speaker. B. Treatment of the back wall In most cases, in order not to absorb the low frequency or make the power of the amplifier too heavy, the back wall of the speaker should be made strong and hard, so that the low frequency can be forced forward and extended better. The area of ​​sound absorption on the back wall is generally between the left and right speakers. The easiest way is to cross the entire back wall into a few frames with the square strips cross-section, then wrap the sound-absorbing cotton with cloth and stuff it into each box. Inside. When the craftsmanship is good, the back wall can be made beautiful. It is also possible to hang the fabric to absorb sound, but the fabric should be thick like a tapeboard to be effective. Try not to nail the cavity with a 3cm board or a 6cm board on the back wall of the speaker. This will absorb too much low frequency, the sound will sound weak and weak, not strong enough and the amount is not enough. Of course, this is not absolute. For example, when there is a 125Hz medium-low frequency standing wave in space, the gypsum board and the 3cm board (both 125Hz sound absorption rate is about 0.28) can be used to make the nail cavity decoration of some walls, and the low frequency can be used. The standing wave absorbs to make the sound more balanced. The corners of the corners, especially the rear wall and side wall of the speaker, are the strongest standing waves. If you can handle it a little, it will help the sound. The way to use space and spend less is to design the corners into bookshelves, CD shelves or display racks. Use the wooden board to seal the right angle as shown in Figure 3. Although it is used for diffusing sound waves, this corner cavity will also absorb low frequencies, and there are gains and losses. C. Listen to the position of the back wall. After listening to the position, the wall can be processed into sound absorption, or it can be processed into diffusion. In many audio-visual rooms, the space is too small to sit against the back wall. The sound heard will be cloudy, so unless your system's low frequency is insufficient to rely on the back wall reflection to enhance the low frequency, the seat is better off the back wall. Above 0.6m, the sound heard is relatively clean. However, when the seat is too close to the back wall and the reflected sound is too strong, the sound absorption process should be taken. On the other hand, the diffusion process can be used to make the sound more natural. The best way is to stick the sound absorbing material on the surface of the diffusion molding, so that both absorption and diffusion can be achieved. What can diffuse sound waves? Any bevel or curved object can diffuse sound waves, but their diffusion frequency range is affected by the width of their own curved face. The diffuser can be self-made in addition to the ready-made one, as shown in Figure 4. Designed as a professional diffuser plate, it can spread a wider frequency. The bumpy pulp pallet with eggs on the farmer's market also has a natural diffusion effect, but its diffusion frequency range is very narrow. Floor and ceiling decoration of the audio-visual room The floor of the living room is mostly made of marble, tile or wooden floor. From the material point of view, the wooden floor is most conducive to sound. When the audio-visual room is decorated with wooden floor, as long as the wooden board is directly and firmly laid on the concrete floor, its characteristics are similar to those of the cement tile floor, and only the reflection effect on the sound wave, the ability to absorb the low frequency. Very low. However, if the wooden floor is nailed into a cavity, it will not only cause vibration, but also has a strong absorption capacity for frequencies below 100 Hz. Therefore, a larger type of speaker should be used in a room with a raised floor. In the experience, the low-frequency and low-frequency of the 20-square-meter room with the wooden floor of the 10-inch woofer. In fact, the main reason for the lack of low-frequency sense is because the listening space reflects the high frequency too much, so that you can't open the loud volume. The low-power amplification simply can't force the original low frequency, causing the imbalance of the full-frequency sense. . The tiled floor is easy to clean, but it is easy to cause the high frequency to be too noisy. The solution to this problem is to lay a thick carpet of about 2~3m2 on the tile floor. The way to determine the position of the carpet is to let the carpet be in the speaker. Listening to the movement between the positions, always find the most noisy places in the high frequency, and also use the ceiling sound absorption treatment. The ceiling is best to absorb sound and diffuse. Otherwise, only hard-diffuse or all-soft sound absorption will make the sound high-frequency reflection sound too strong or too weak. There are three ways to recommend ceilings for home theater networks: A. Light steel frame plus mineral fiber board design, it is effective for suppressing excessive indoor reverberation and high frequency, but without any diffusion function. B. Diffusion and absorption design of small arc panel. The specific method is to take each curved piece with a length of 50-60cm and a width of 30~40cm. As shown in Figure 5, stick it on the downward side of the arc. On the PVC paper, the concave side is glued with foam or sound-absorbing cotton (cannot use fiberglass cotton to avoid affecting health). This design can absorb and diffuse, and it will not form a cavity to absorb medium and low frequency. Nail the wooden strips on the ceiling and secure the sheets together. You don't have to stick to the entire ceiling. You can do it first in the middle of the optional ceiling and above the listening position. If the effect is not obvious, continue to expand. The frequency at which diffusion is desired is not limited by the area of ​​the arc, and a variety of arc plates of different specifications are available. C. The inside adopts the design of absorption and diffusion setting and the appearance of stretcher. This design is very beautiful but time-consuming. Firstly, the material that absorbs and diffuses is placed on the ceiling, and then the lattice is placed, and the cloth is tightly covered with a beautiful cloth. This way, it is both beautiful and practical. More home theater decoration knowledge is in the Chinese home theater network, welcome to pay attention to WeChat: cnhifi. Custom Pattern Light,Color Changing LED,Led Projector Light,LED Battery Operated XINGYONG XMAS OPTICAL (DONGGUAN ) CO., LTD , https://www.xingyongxmas.com
November 05, 2020