[Home Theater Network HDAV.com.cn] A friend of the author is very anxious to find the author, because recently he always watched the ball at night, watching the big film, his neighbor downstairs finally found him to find him. His neighbor said: "The rhythm of the rhythm is like knocking on the heart, lying in bed and worrying that the ceiling will fall. How can this state sleep well?" The result is a month down. The old man who had hypertension had "relapsed old disease", his blood pressure continued to rise, and he also added new diseases of neurasthenia. However, the author's friend deliberately measured by instrument, the strange thing is that it is only about 40 to 50, but the effect is very shocking. Needless to say, this is definitely a bad soundproofing, and the subwoofer is a curse! The friend said: With a subwoofer, watching movies, listening to music is extremely enjoyable! The shocking sofa shakes, the skin shakes, but it is upstairs and downstairs. Neighbors can't stand it! I don't feel very much listening to myself! But I can't hear the sound of music upstairs and downstairs, I only hear the heavy bass, and I feel very uncomfortable!
Looking at the forum, I found that many netizens have similar problems. One of them said that my family is already on the ground floor, but the subwoofer will affect the neighbors on the second floor. In fact, this is mainly because the vibration of the low frequency is too far. Hey! I believe many enthusiasts have encountered such a problem. You said that if the volume of the home theater is not enough, it is very uncomfortable to watch the blockbuster! The volume is loud and disturbs the family and disturbs the neighbors. Therefore, sound insulation is the first thing that needs to be solved in theater decoration. This is harder to understand for friends who are not very good. They may ask: I don't know what obvious soundproofing methods, such as laying carpets. How to make sound insulation on the ceiling and wall of the room? How much does it cost to sound-proof wall and ceiling soundproofing materials? In short, there are many friends who say that before you can find a good solution, you can only try to adjust the volume as much as possible, even without a gun... In fact, it is also Without the gun, the author believes that the key is that the sound insulation measures are in place. If the sound insulation measures are not in place, it is not just a subwoofer. Other speakers will harass the neighbors. So today we will talk in detail about how the home theater's sound insulation measures should be done.
Sound insulation of doors and windows
From common sense, we know that the intensity of noise can be expressed in terms of sound level in decibels (dB). Noise level of 30 to 40 decibels is a relatively quiet and normal environment; more than 50 decibels will affect sleep and rest; more than 70 decibels interfere with conversation, causing distraction, lack of concentration; long-term work or living in a noise environment above 90 decibels It can seriously affect hearing and other diseases such as cardiovascular diseases. According to most netizens, the sound insulation of the rooms in the real estates that are currently purchased is generally not ideal. Doors, windows, walls, floors and ceilings will pass in the sound of the outdoor, and the sound of the room will be transmitted, especially for the low frequency. Spread farther. Doors and windows are the weak link of sound insulation. Generally, only the door and the window are usually treated by the family. For example, the window can be made into two layers, that is, another layer is added to the existing window. Of course, the window must have Good sealing, this is the least expensive and effective way. 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!
However, the method is only second. The key is how to choose soundproof windows and doors. The author recommends plastic steel doors and windows. The sound insulation performance of the window depends on the tightness between the two windows and between the window and the window frame, and the opening of the window depends on the tightness of the closed window and the frame. The plastic steel doors and windows are generally sealed with rubber strips. The "hard touch" of aluminum alloy windows is different, and the sound insulation effect is more obvious. Moreover, the current styles of plastic steel doors and windows are diverse. In addition to the traditional internal and external swinging, push-pull and folding styles, there are also interiors that open and close the doors and windows, push and pull the hanging doors and windows, push and pull the lower hanging doors and windows. Although the price is higher, in order to have a quiet environment, this investment is worthwhile. In addition, if you think that the sound insulation of ordinary glass is not enough, I suggest you to use insulating glass. The insulating glass is made up of two or more layers of flat glass, and two pieces of high-strength airtight composite adhesive are used around. Multiple pieces of glass are bonded to the aluminum alloy frame or rubber strip, leaving a space between the sealing glass and flushing with inert gas for excellent thermal and acoustic insulation. Due to the poor heat transfer performance of the air or gas sealed in the glass, superior sound insulation is produced.
In addition, the effect of laminated glass is also good, laminated glass refers to the PVB interlayer film between two or more pieces of glass, PVB interlayer film can reduce the amount of noise penetrating the glass, reduce noise decibel, and achieve sound insulation. For example, laminated glass made of SAflex PVB plastic interlayer can effectively block the common 1000-2000 Hz anastomosis noise. At present, the price of plastic steel doors and windows on the market is uneven. As long as the plastic steel window is as low as three hundred and two hundred square meters, the imported products can cost more than 1,000 yuan. The price of plastic steel doors varies greatly, ranging from a few hundred yuan to more than 3,000 yuan, depending on quality and specifications.
Sound insulation of the wall
Whether the wall needs to be soundproofed depends on the building quality of the building or the sound insulation effect. Generally speaking, the building quality of commercial houses is relatively good, and the sound insulation effect is also better; while the affordable housing, especially the relocation houses that are demolished and rebuilt, the building quality is uneven. The load-bearing walls of ordinary houses are made of steel plate concrete or solid bricks, which have good sound insulation effect. The problem is more than the light hollow brick or gray plastic cardboard used in the partition wall. The sound insulation characteristics are only -25dB~-30dB. Most home theater rooms have one or two wall surfaces. I have encountered the worst quality of the relocated house, the sound insulation effect is poor, the phone ringing of the neighbors and the content of the call can be basically heard clearly! Walls like this must be soundproofed.
The sound insulation of the wall is related to its thickness and surface treatment. There are two specific solutions.
First, remove the original wall and rebuild a soundproof wall;
The second is to retain the original wall and add a soundproof 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 (FC) separation wall can be added to the inside to improve its sound insulation. Consumers who can spend a lot of money can also lay more expensive sound-absorbing panels on the 4 walls, so the effect is quite good!
The soundproofing of the floor and the treatment of the wall can only work on the left and right sides, but the most difficult thing in the soundproofing project is the upstairs and downstairs! First, because the thickness of the floor is usually thinner than the wall, then the floor. The area is usually larger than the wall area of ​​any room in the same room (that is, if the living room area is 4x6, then if the floor height is less than 4 meters, there will be no wall area equal to or larger than the floor area). In addition, the sound insulation treatment of the upper and lower floors is far more difficult than the sound insulation of the wall, coupled with the limitation of the floor height and material cost, which makes the floor the weakest link and the most difficult place to deal with. .
First of all, the treatment of the floor, the ideal residential floor slamming impact sound pressure level should be less than 65dB. However, the weighted impact sound pressure level of the ordinary 10cm thick concrete floor slab used in large amount is 80-82dB, and the sound insulation problem of the floor slab is serious.
Some netizens suggested that a layer of high-density glass wool damping cushion should be 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. However, these practices are relatively large. For simple points, you can use the sound-absorbing cotton with a thickness of 5 cm between the keel and the keel. Then use a fir-tree to lay the 8mm-thick carpet.
The author's opinion is a bit different. If you want to be cheap and want to not affect the downstairs, I suggest that when decorating, first lay a 1-2 layer large core board on the floor, and then lay the floor. This not only can not affect the downstairs, but also can be cut in the large core layer slot, much easier than slotting on the wall, the sound insulation effect is very good. If you have a little rice, you can put a layer of plywood on the big core board, and stick a layer of Portuguese cork flooring on the splint. The sound insulation effect is very obvious. It is clear that the Portuguese cork floor is more expensive! Also, the author I also specifically consulted the famous online hero Epson on this issue. In the E version, he also recommended Portuguese cork flooring. Due to its unique honeycomb-like wooden structure, Cork has a large amount of air, excellent elasticity and wear resistance, and its wear resistance is 200 times that of hardwood flooring. Under the microscope, the surface of the cork floor is a small suction cup formed by numerous cut cork cells, which reduces the relative movement of the foot and the floor, increases the friction coefficient, reduces the friction, and achieves the purpose of anti-slip, even if the floor There is water or oil on it, and it does not cause people to slip. The coefficient of friction is 0.4, which is an excellent standard of 6 (up to 7).
In 1932, a simple cork floor of only 1 cm thick was used in the Beijing Capital Library. It has worn away only 0.5 mm for more than 70 years! The cellular structure of the honeycomb has made the name of the "natural sound absorber" of cork flooring. . Finally, after laying the floor, it is recommended to lay a thick layer of carpet, at least 3cm or more, which is perfect. When the ceiling is used for soundproofing, if there are neighbors upstairs, the effect of the subwoofer on the upstairs neighbors may be greater than that of the downstairs! At the same time, the ceiling is also the most difficult to handle, and it is also the focus of the cinema project. 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 steps are as follows: Preparation materials: special sound absorbing panels and sound insulation panels for ceilings.
1. Push the dense and solid dragon skeleton on the top to prevent the common shock and cause abnormal noise.
2. The dimensions of the light steel keel are 18X26X300mm (preferably steel-wood combined).
3. Suspend the light steel keel with a metal hook (4 mm in diameter).
4. Install the sound absorbing panel on the ceiling of the ceiling, and then lock it with a 45X38mm locking steel clamp.
5. Cover the sound absorbing panel with sound absorbing glass wool (preferably with surrounding fiber cotton). The specifications are: thickness 50mm, density 32kg/m2, length dimension 1200X600mm.
6. Then put a professional acoustic board on the sound absorbing panel. It is worth mentioning that the material used for the ceiling is more expensive, just one or two thousand, so the budget is sufficient.
Soundproofing of the subwoofer Why do the subwoofers have to be dealt with separately? Because the low frequency emitted by the subwoofer is very strong due to the wavelength, and the low frequency vibration of the subwoofer is very strong and can be directly transmitted in the floor of the floor. And the speed of sound propagation in solids is much higher than in air, and the attenuation is much lower than in air, so the lower the frequency, the stronger the energy, such as the KSW 15 subwoofer The sound pressure can exceed the sound pressure of the Boeing 747 when landing, so it is not a solid measure, how to resist it? Now the common practice of the enthusiasts is to give the subwoofer pad a granite plate with a thickness of 4CM or more, because the granite plate The mass inertia 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 that the subwoofer can be directly coupled with the floor, and the bass can be effectively transmitted to the downstairs. It will greatly reduce the impact on the residents downstairs. At the same time, the granite plate on the subwoofer pad helps to improve the sound quality. Among them, the shock-absorbing rubber block, the insulation material shop is available for sale, each piece is 4 yuan, or the sponge pad for children's puzzles can be placed under the granite plate, and it is better to choose the pad without the puzzle, only 5 corners! Cheap and good effect!
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