Necessary work before the establishment of the audio-visual room and home theater
The “home theater and audio-visual room†system has gradually become a must-have for the family, but its formation still needs some technology. Many people tend to make it look like it. It has not been better viewed because of the addition of new equipment and the use of new technologies. Feel that those advanced equipment did not play its full power or even become a display. Home theater is a complete audio and video replay system, including signal source, audio playback and video display, including the use of environment, system composition, collocation, connection, manipulation and many other content. They must be organically integrated to form a harmonious whole, sometimes to kiss people's aesthetic vision, living habits, and even indoor environment. First, determine the use of space 1. The use of space home theater as the name suggests is the theater system used at home, so it must have a place to be placed, is the living room, bedroom, study, or a dedicated audio-visual room. Different environments have different requirements for equipment. The open and closed spaces create completely different audio and video effects. This is the first consideration. If the audio-visual system is set up in a public activity area, such as a living room, it should be a stylish and simple system, and consider the coordination with the environment; in a separate space, such as a specially planned audio-visual room, you can enjoy it to the enthusiast level. Combination and matching is better. For good shading, consider a large-screen projector. It is best not to use a professional or business projector with a screen ratio of 4:3. Instead, use a 16:9 home video projector. Note that there is no special light protection. In the brighter environment, it is not suitable to use the projector as a video playback device, and the large-size TV is more suitable. The 16:9 32-inch screen is the most basic requirement. Under the conditions of the environment, the large-size TV is more Can create a good cinema effect. Welcome to China Home Theater Network 2. It is best not to use large speakers for small rooms. Do not use small LCD TVs for large rooms. This is the basic knowledge of optional equipment. Generally speaking, the enclosed space of 18 square meters or more can use the projector, and the audio-visual room of 50 square meters or more has to take out a large amount of equipment to purchase funds, but also have good acoustic treatment, of course, the effect is also difficult to reach a small room. of. However, there is no absolute matter. If the equipment is carefully selected and the room characteristics are adjusted, even if it is only 10 square meters, it can also play a good effect. 3. The proportion of the room should not be used in the room where the length, width and height of the room are integer multiples. Otherwise, the strong standing wave will make all efforts hard to give up, and no matter how good the equipment will not have a good sound in such an environment. If you have no choice, you must reduce the standing wave by simple acoustic treatment, furniture and other indoor products. If conditions permit, change the proportion of the room during the renovation by means of ceiling, partition or floor treatment. 4. Space, Acoustic Processing If sufficient funds are available, professional acoustic processing will help you get twice the result with half the effort. Audiovisual consultants can help, but there are not many high-level companies. If you don't have enough investment, you can't just be accompanied by bad voices. As long as you use your heart, you can get good results. But some basic acoustic rules must be followed, such as not having too many, too large glass windows, cabinets, not too thin bookcases, etc. These hardware or loose objects are sound killers, especially for low frequencies. This kind of environment is completely a disaster, and it is not reasonable. Carpets, sofas, bookcases, paintings, curtains, etc. are all good props for tuning. The environment of spreading, absorbing and other treatments is definitely much better than the four walls. In addition, if the upper screen is projected, in addition to the strict shading treatment, the room color should not be too bright, avoiding the reflective projection back to the screen, making the image gray and the details lost. Second, the interior design should ensure audiovisual effects 1. Material selection. Many of the decorative materials currently used in the home do not meet the audiovisual requirements. For example, the use of glass, ceramic tiles and stone materials can cause excessive reflection of sound waves and light, affecting the audio-visual effect. Considering the audio-visual effects, the ideal decorative materials are low-reflective decorative fabrics, wallpapers, wood, and dark paints. 2. Furniture selection. When choosing furniture, it is best to choose furniture made of solid materials. In order to avoid the tremors, the furniture in the room should be solid and secure, especially the glass doors on the furniture, the glass shelves of the display cabinets, etc., must be tight and secure. 3. Late accessories. In the choice of the later decorations, we should try our best to avoid the singer and let the audio-visual equipment in the living room sing the "protagonist". Especially in the choice of decorative paintings and green plants, pay more attention to this. 4. Audiovisual background wall. The so-called audio-visual background wall is the wall behind the TV and audio. For optimal audiovisual performance, this wall is best decorated in soft or wood. In terms of color and pattern design, the audio-visual background wall is not "obseen". Third, determine the amount and proportion of investment Some people will consider investing first when setting up a home theater, but the environment is the most important. If the environment is not good and it will not be processed, no amount of investment will be useless. Money is not a panacea. If the adjustment is square, the equipment of the price will have a good effect. As for investment, entry-level video equipment together with 20,000 yuan can basically meet the standard, more than 1 million large investment, if you do not carefully adjust the effect is also very common, the key is whether the user carefully designed. Welcome to China's home theater network as far as the proportion of investment, in the 50,000 ~ 100,000 yuan, signal source: video: audio: accessories (wire, rack, etc.) is 1:3:4:1 ratio is more appropriate. But this is not absolute. Sometimes the characteristics of equipment, cost-effectiveness and other factors will also affect the distribution of investment proportions. It is necessary to be flexible in terms of local conditions. The important thing is that the proportion of investment should not be too unbalanced to form a bucket effect. Fourth, wire pre-buried and connected <br> Before the decoration, it is best to plan the wire, including the power line, speaker line, signal line, set the position, as well as lighting, control, etc., preferably acoustic treatment Do it together, or hanging the line everywhere can be annoying. Remember to use high-quality wire, and don't forget to add the root HDMI cable. Now it's better to use digital transmission for audio and video. Wire connection also has a lot of skills, but some basic principles are also to be observed. For example, the signal line should not be close to the power line or speaker line; the digital transmission should be clearly separated from the analog transmission; the wire should not be significantly smaller than 90 degrees. Bend and so on. Five, pay attention to matching skills High-brightness projectors with low-gain projection screens and low-sensitivity speakers with high-power amplifiers are basic collocation rules. Each piece of equipment has its own style and personality. To be integrated, users should go to the audio city and the store several times, listen more, and learn more about it. Sixth, the placement of audio-visual equipment 1. The placement of equipment such as TV sets and AV amplifiers is best done in a flat-type machine instead of being stacked like a stack of arhats. The equipment racks are layered with various audio equipment, and the top layer of the equipment is placed on a large screen color TV. A 29-inch color TV weighs about 50 kilograms, plus DVD, deck, AV amplifier, video recorder and other equipment, its weight is not light. Therefore the frame must be strong and the height between the frame laminates should preferably be adjusted. The TV and the speakers should not be placed on the same horizontal line, otherwise the picture on the screen will be retracted when the sound is played back. The correct way is to place the TV in front of the speaker. 2. Installation of the speakers The arrangement of the two speakers should maintain the symmetry of the sound characteristics. The listener and the left and right speakers are preferably isosceles triangles, and the distance between the two speakers is preferably 2.5 to 3 meters. In a normal room, the speakers can be placed on the wide side of the room, the distance between the speakers and the wall should not be less than 0.2 meters, and try to make the reflection on both sides of the room approximately the same. There should be an open area in front of the speaker so that the sound waves reach the listener's position. Don't discharge the phonograph on the speaker, otherwise it will cause howling; don't put the artwork, avoid the resonance and destroy the sound quality. The placement height is an important factor affecting the playback quality, because the tweeter in the speaker is highly directional, so that the axis of the tweeter should be at the same height as the listener's ear. In addition, the reflection and diffraction phenomenon is prominent when the bass is transmitted, so the height of the woofer from the ground directly affects the bass quality. In order to allow the speaker to fit the sound reproduction, the speaker stand is usually used to adjust the height and steering of the speaker. The speaker stand is made of wood or metal, but it must be strong and cannot vibrate. Generally, the home theater may use more than 5 speakers. The center speaker can be placed under or above the TV, but it must be anti-magnetic, otherwise the picture tube will be magnetized. Two surround boxes can be placed on the side of the listener's side, slightly above the listener's head. It can be placed on a dedicated stand or it can be attached to the metal stand with an expansion screw before the speaker is installed. 3. The layout of audio-visual equipment should consider the decoration effect of the room. Whether it is TV or audio, most of them are black and gray rectangles. This traditional shape is easier to place. The average family is accustomed to placing audiovisual equipment in the living room, but many families only pay attention to the size of the audiovisual equipment and rarely consider the size of the room. If you put a large speaker in a small living room, it looks very uncoordinated and the listening effect is not good. At present, the living room of most families is bright and elegant, and the black-gray TV or stereo placed in the corner of the room can be a good decoration. If the room size is large, the audio-visual equipment can occupy a wall position, and attention should be paid to the high-profile combination and the patchwork when placed. If the room size is too small, it can occupy a small corner of the room, and set up some small decorations, such as flower arrangements and small ornaments, to make the corners of the electrical appliances with deep colors become vivid. Seven, equipment debugging and system adjustment When the equipment is in place, the commissioning work begins after the installation is completed. There is no sound, no picture, you need to understand the function of each piece of equipment. TVs and projectors must be borrowed from software to test and adjust. For example, "HIVI CAST" is an easy-to-use debugging software. The sound is more complicated. In addition to the correct installation according to the cinema standard, the position and angle of the center and the surround should be adjusted repeatedly. There is also a “subwoofer†that needs to be moved a little bit and try a little bit. The home theater environment involves acoustic processing techniques such as sound absorption and diffusion, and also designs optical processing technology. There are skills everywhere, and it is necessary to learn more, read more, and listen more.