[Home Theater Network HDAV.com.cn] Friends who have a home theater in their homes will definitely install a subwoofer. Its perfect sound quality is fascinating, but sometimes it will cause some trouble. Hey, I just said that someone knocked at the door. It must be protesting that my son watched the movie last night and turned the sound high. There must be many friends who have the same experience as me. Here I will see you who will join the home theater. I believe that when buying a subwoofer, you must also count the cost of soundproofing measures, otherwise you should not buy it, because you can't use it if you buy it, your family and neighbors will have opinions about you. Unless it is ready for sound insulation.
The first measure: door and window sound insulation
We know that the general sound insulation effect of doors and windows is not high. We often hear the sound coming in from outside, and the low-frequency sound travels far away, and the interference effect is more significant. So what should we do? Make the window double-layer, that is, add another layer to the existing window. Of course, the window should have good sealing performance, which is the least costly and effective method. For the sound insulation treatment of the door, a hollow double-layered door with a cavity can be adopted, the panel is made of plywood, and the sound-absorbing cotton is laid in the middle. If the door panel is a multi-layer composite sandwich door, the door seam should be made into a slanted opening, plus a blanket or rubber strip seal, so that there is already a relatively effective effect!
The second measure: sound insulation treatment of the wall
The first method is to remove the original wallboard, add gray cardboard on both sides, and stuff the glass fiber between them. This kind of scheme will have a good effect. The second method is to retain the original partition wall, and add a few columns to form a sound insulation wall with glass fiber inside. If you want to be simple, evenly apply a layer of cement to both sides of the brick wall you have built. Increasing its areal density is the most effective and economical way to increase the sound insulation. The gaps and holes in the leaking sound also have an effect on the sound insulation of the room, especially for the sound insulation of the intermediate frequency part, which must be sealed. In the case of a lightweight wall, a low-density gypsum board or a cement fiber pressure plate can be added to the inside.
The third measure: the sound insulation of the floor
A high-density glass wool damping cushion is laid on the structural floor and then 40mm thick concrete floor. The weighted impact sound pressure level can be less than 60dB. Some suggest that the ground be paved with river stone + sand, then grind 3cm of cement on top, and then lay the floor. Of course, if the wooden floor is nailed into a cavity, it will have a good absorption capacity below 100 Hz, and the low frequency effect of the sound will be very good. And laying pebbles under the floor can just fill the gap that easily causes standing waves and co-seismic, and even the drawbacks of the hollow wooden floor can be overcome.
The fourth measure: the sound insulation of the ceiling
Many people want to make a ceiling when decorating, but the ceiling material is relatively thin, especially the three-ply board is more likely to cause resonance. Nowadays, the general person's treatment method is to use the light gypsum to make the uneven surface of the tortuous plate on the top of the ceiling, so that it is not easy to cause reflection, and does not reduce the actual height of the room, and is more economical. When the floor height exceeds 3 meters, it can be constructed by evenly drilled lightweight gypsum board (a special perforated sound-absorbing sheet) and gypsum inlay with uneven surface, which is both beautiful and sound-proof. Some friends also made a flat ceiling through the keel, ultra-fine glass, and splint, and also became a thin-plate resonant sound-absorbing device to meet the sound-building effect. However, the author thinks that, in general, the ceiling is also best for both sound absorption and sound insulation. And for better sound insulation, it is best to use a professional sound insulation material to make a special soundproof ceiling.
The fifth measure: sound source is the sound insulation of the subwoofer
It is a granite plate with a thickness of 4CM or more on the subwoofer pad. Because the mass inertia of the granite plate can absorb part of the vibration energy of the subwoofer, and then a flexible buffer layer such as rubber/carpet is placed between the granite plate and the floor, so as to avoid The subwoofer is directly coupled to the floor, which effectively isolates the bass and delivers it downstairs, which greatly reduces the impact on the downstairs. At the same time, the granite plate on the subwoofer pad helps to improve the sound quality.
Commonly used sound insulation materials:
1. Soundproof felt
Sound insulation felt is a good room sound insulation material on the market. It is mainly used in combination with gypsum board for wall sound insulation and ceiling sound insulation, as well as for sound insulation and damping of pipes and mechanical equipment. The soundproof felt is not felt, it looks completely different in appearance, the felt is light and soft, and the soundproof felt is thin and heavy.
The soundproof felt is made of odorless EPDM rubber and a dozen kinds of organic minerals in a certain proportion. The product is black, environmentally friendly and has no odor. It has a good sound insulation material for low frequency and high frequency sound, which can effectively suppress various kinds. The vibration spread, the thickness of the material is 1mm, 2mm, 3mm. According to the National Building Materials Bureau, the weighted sound insulation Rw is 23dB, 27dB, 30dB, and the flexibility of the material is also very good. It can be bent and cut freely. Very convenient and fireproof soundproofing material.
The acoustic felt has the following advantages:
1). The material is light and ultra-thin;
2). Soft, strong tensile strength;
3). Environmental protection, no pollution to the environment;
4). suppress the propagation of low-frequency sound waves; excellent flame retardant performance;
5). Convenient construction.
2, polyester fiber sound absorbing panels
It is an ideal indoor sound insulation material. Its raw material is 100% polyester fiber, which has sound absorption, environmental protection, flame retardant, heat insulation, heat preservation, moisture proof, mildew resistance, easy dust removal, easy cutting, can be parquet, simple construction, good stability, good impact resistance and independence. Good character, high cost performance, etc., a variety of colors to choose from, to meet the needs of different styles and levels of sound-absorbing decoration. Mainly used in theaters, concert halls, museums, exhibition halls, libraries, interrogation rooms, galleries, auction halls, gymnasiums, lecture halls, multi-purpose halls, hotel lobbies, hospitals, shopping malls, schools, piano rooms, conference rooms, studios , recording studios, KTV rooms, bars, industrial plants, machine rooms, home noise reduction and other places that require high acoustic environment and high-end decoration.
3, wave sound absorption sponge
The indoor soundproofing material of the wave sound absorbing sponge is a kind of sponge which is specially treated to form a concave and convex wave shape. The inside is filled with fine voids and a semi-opening structure, which can absorb a large amount of incident sound wave energy and attenuate sound waves. It reduces the interference and reverberation of indoor reflected sound and improves the purity of sound. The main performance characteristics are:
1, high sound absorption rate
2, good insulation
3, flame retardant grade B1
4, the structure is tight, the shape is stable
5, the weight is very light, construction is safe and convenient
6, harmless to the human body, no pollution to the environment, no odor
7, water resistance, strong drainage after water immersion, sound absorption performance does not decline, the shape remains unchanged
8, can be used twice, easy to destroy, no secondary pollution to the environment
Note on the purchase of soundproof materials:
1, soundproof window purchase
Look at the materials: including aluminum profiles, glass, hardware, color is consistent, hardware assembly is complete.
Look at processing: high-quality aluminum alloy window, fine processing, smooth tangent, uniform angle (the main frame is usually 45 degrees or 90 degrees), there should be no obvious gaps in the stitching process, the switch is smooth.
Look at the glass: see if it is hollow glass, there is no coating, and the composite film is generally resistant to corrosion, abrasion and high gloss.
Look at the size: check if the window size is correct.
2, soundproof door purchase
Look at the weight: the formula of the sound insulation is directly related to the density of the material, so the sound insulation with high density is relatively good, and the molded door is relatively light, which is the source of poor sound insulation of the molded door. But note: the soundproof cotton in the middle of the flat hollow door will be more soundproof than the solid wood door.
Look at the thickness: the thicker the surface layer, the better the sound insulation effect. The general laminate of the wooden door should be 8mm thick. The thickness of the surface layer is also good, but the cost is increased. However: the iron surface of the iron plate fire door is 3mm thick, and the sound insulation effect is also good.
Look at the flatness: the flatter the wooden door, the better the combination with the door cover, regardless of the structure. As long as the deformation of the wooden door is not soundproof.
Tips for selecting soundproof doors: The sound insulation of the door mainly depends on the quality of the door panel, mainly depending on the filling of the core of the door. Generally, the core of the molded soundproof door is filled with a paper base of a honeycomb structure, and the closed air layer formed by the core can provide good sound insulation. More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
Note: This article is transferred from the HD era. Author: Gao Bin. The article is an independent view of the author and does not represent the position of the home theater network.
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