The happiest thing in life is to watch movies and eat in the cinema of your own home, in addition to eating while watching TV. If you have a room at home or a qualified friend, you may wish to try to design a "private cinema" in your own home. If you want to see it, you will feel super cool. This issue of Xiaobian will introduce how to design a home theater, what are the requirements and precautions.
About home theater design is not as simple as we think, as long as there is an empty room, then install the equipment, and then do a good job of noise prevention. He still has a lot of professional factors to consider. The basic requirements of the home theater for the environment are "black, empty, and quiet." Air and static are mainly for the listening environment, while black is for the lighting environment. “Empty†means that in addition to the necessary supplies and seats in the room, others should not be placed as much as possible, so that when the room is limited in size, the room can be enlarged to facilitate the creation of a grand sound field and interference with the viewer. Sight. “Static†refers to the intrusion of various sounds or noises that should be isolated from the outdoors as much as possible. At the same time, there should be no extraneous sounds in the room, so as not to interfere with the sound reproduction effect, and ensure that the viewers concentrate on watching the movie. Little nonsense will not say much. Let's take a look at some of the opinions of professionals about our design of home theaters, as well as matters needing attention.
[Home theater visual design considerations]
1. When designing optics for home theater, the first thing to pay attention to is the interference of the external light of the room on the picture. Under normal circumstances, it is recommended that in the home theater room, except for a low-illumination light of 15W or less installed on the side of the projection screen (as far as possible from each other), there should be no other direct illumination. The position of the illuminator should be chosen so that its light is not reflected on the screen. In addition, it is necessary to isolate the interference of external light as much as possible so that it can be observed normally.
The way external light interferes with the picture is mainly through windows and door seams. When creating a professional audio-visual room, keep the window as much as possible to get the ideal picture and sound. If the window is picturesque and the user insists on keeping the window, multiple layers of curtains (at least one layer of black curtains) can be used to absorb or reflect the interference of the light on the room. Strictly speaking, the construction of windows can also cause sound interference. It is best to install soundproof glass on the windows.
There are also many families who want to do living room-style home theater design, because it can realize the multi-functional use of a space. It can usually be used for hospitality and family entertainment, and can also meet the entertainment needs of the family. A good solution. The living room generally has a large window for ventilation, etc. It requires the help of multi-layer windows and soundproof glass to enhance the viewing effect.
2. When designing optics for home theater, pay attention to the influence of indoor lighting on the screen.
The indoor lighting design should pay attention to not being able to cast directly on the screen. The picture of the lighting and the projector lumens will deviate from the effect that the film director wants to perform. At the same time, it is also best to turn off all lights when watching movies, to avoid light pollution caused by reflections from walls and the like. The lighting design of the small theater of Shengyi is to avoid the direct projection screen, but the direct projection is downward and the coverage is small, so as not to affect the clarity of the image as much as possible. Of course, the scene mode used in the real viewing is that only the step lights are bright and only the step parts are illuminated.
3. When designing optics in the home theater, try to avoid the effects of light reflection caused by various walls, floors and ceilings.
At this point we can lay a carpet with a certain light absorption function on the ground, the ceiling is better for dark, or absorb light around the screen. The projection picture is large, the light in the picture will be reflected to the surrounding wall, ceiling and floor. If these positions are not absorbed, the light will be reflected on the screen, causing the details of the picture to be lost, and even the color shift. .
4, home theater design Now many will use hidden design, the use of sound through the screen.
At this time, it is necessary to pay attention to the interference caused by the reflection of the light reflected by the back box behind the curtain. There are many sound-permeable holes on the surface of the sound-transmitting screen, and more than sound will pass through the sound-permeable holes, and light will pass through these sound-permeable holes. The light transmitted from the projector on the screen is also partially transmitted through the sound transmission hole to the front speakers. At this time, if the surface of the speaker is not a non-reflective material, you need to consider some light absorption treatment, but now some manufacturers have noticed this problem, they will add a layer of light-absorbing curtain behind the sound-permeable curtain to avoid this. A problem.
5, when the home theater design optics, but also pay attention to the furniture reflective and home placement.
Many home theater users prefer a sofa that is leather or leather-like, with a glossy finish that is very easy to reflect light. At this point we should not place the sofa very close to the curtain. If the size of the room is small and the sofa is close to the curtain, consider a fabric sofa. The surface of the fabric sofa is not particularly susceptible to light reflections.
6. It is recommended that the equipment used in home theater design use a hidden installation method, which should not be placed in the environment around the screen.
In general, the appearance of AV equipment such as AV amplifiers may be gold and silver that are extremely susceptible to light reflection. If hidden installation is not possible, it is recommended that all equipment be placed in the cabinet in a structured manner. A well-designed cabinet not only does not interfere with the reflected light of the picture, but also can be effectively integrated into the audio-visual room, and can also play a certain sound reflection and diffusion effect.
[Home theater acoustic design considerations]
When designing a home theater, there are many factors that affect the acoustic properties of the room, such as the shape of the room, the size ratio, the reverberation time, and the sound insulation performance. If the interior decoration is unreasonable, even if you have the best home theater configuration, you can't enjoy the real music, and the sound of the movie will disappoint you. It's like when you move a set of hi-fi to the bathroom and play it, you will find it really terrible to "listen".
Home theater acoustic processing is mainly to make the sound fidelity high, and there is no noise or noise.
1. Lay a thick carpet on the ground. Perhaps the most likely to be a serious reflection of sound waves is the ground. Although the carpet does not work well for low frequencies, the first thing to do is to try to absorb some high frequency reflections. The early reflections formed by the first 5mS or a few milliseconds after the direct sound will become part of the direct sound, and because they are mostly from the same direction, they will be heard. You should avoid letting the audible innocent speakers mix with the high-frequency sound that is reflected from the ground. And because it's unlikely to add some soft padding to the ceiling, if you don't lay the carpet on the floor, there will be two parallel and reflective surfaces, and the sound waves will be reflected back and forth between the ground and the ceiling. Make the sound ugly.
2. The ceiling is also an important way to introduce noise. Ceilings with poor quality and thin floors tend to transmit noise. It is best to install a high-intensity, well-structured sound-absorbing ceiling for the ceiling. It is good-looking, and has sound absorption and sound insulation for the audio-visual room. It also improves the proportional characteristics of the room. In order to enhance the effect of the film sound, you can also add a layer of velvet or velvety fabric on the decorated ceiling, which can also reduce the reflection of sound waves.
3. When designing a home theater, you should also pay attention to the handling of doors and windows. The purpose is to separate sound, sound absorption and dust. Most of the outdoor noise enters the room through doors and windows. Good wooden doors provide excellent sound insulation. After the double-glazed barrier, the noise entering the room and out of the room can be significantly reduced. The air conditioning duct is the inlet of the air inlet and the noise inlet. Curtains and curtains can be made of velvet and velvet to reduce the reflection of sound waves and the resonance of the glass window. Hang curtains on the window. In some concert halls, glass with reflection is always avoided.
In the audio-visual room, the reflected sound of the glass is easily annoying because the walls are all close together. You can try to hang some curtains that can be opened on the window and pull the curtains while listening to music. Also, do not place bookcases and homes with glass front panels in the room.
4. Try to destroy the reflection of the parallel wall. Parallel walls, like the ground and ceiling, are likely to produce endless reflections, resulting in “multiple echoes†that make the sound unpleasant. You can slap your hands hard. If you hear the echo, it will indicate some problems in the audio-visual room. Bookshelves, especially bookshelves that randomly place books, can be used as a diffuser for sound waves to block reflections from parallel planes. Although there are already some specially produced sound diffusing screens for sale, several bookshelves are placed in the listening room. It can be quite good.
5, can not let the reverberation too long. Placing small foam blocks at the mirror reflection point does not cause excessive changes in the listening room. However, if you stick a large piece of foam or hang a fairly thick curtain, you will feel the sound of the replayed music because of too much sound absorption. Thin and light sound absorbing materials will absorb high frequencies well, but will not work for low frequencies. Generally, the thickness of the sound absorbing material is substantially equal to half the wavelength of the sound wave, and it plays the role of sound absorption. For a 10 kHz sound wave, the wavelength is only 3.4 cm, so a high frequency can be absorbed by a foam having a thickness of several centimeters; however, for a low frequency of 200 Hz, since the wavelength is as large as 1.7 m, the thickness is only a few centimeters. The natural foam will not help. As a result, there will be a significant imbalance in tone in the listening room. Most of what people hear is a sound field with reverberation, and the high frequencies are mostly absorbed and the low frequencies are absorbed very little.
In addition to hard decoration, home theater design should also consider the location of the equipment, and even on what kind of table is also very particular. Granite is preferred for carrying equipment, but the thickness of granite is preferably above 3 cm. Some people are afraid of machine vibration and affect the sound quality. They often put the disc player and power amplifier directly on the ground, and even use the carpet as a cushion. It is hoped that there will be vibration absorption. In theory, it seems that the floor is hard and the vibration is minimal. It seems to work, but in practice. In the experiment, the sound is the worst one.
Summary: There are still many things to pay attention to in the design process of home theater. I really want to install a friend's suggestion at home or find a professional to help design. They can pay more attention to the problem of playing the minute, so as to ensure the effect of home theater. Reach the best.
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