How to enhance the sound insulation effect of the room

The key to soundproofing is to strike a balance, which is very important. Taking a home with a steel plate concrete structure as an example, the sound insulation properties of concrete walls can reach -50dB, while the sound insulation properties of windows are only -25dB. There is a -25dB gap between the two. Eliminating this gap is the purpose of the sound insulation project. Even if you increase the sound insulation properties of the surrounding walls to -60dB, if no measures are taken to the original windows, the sound insulation properties of the entire room will still be only -25dB; just like a deep bucket, if a part is missing, the water will flow from there. When the water flows out, the depth of the bucket can only be calculated to the location of the defect. The same goes for sound.

Before taking soundproofing measures for your listening room, carefully analyze where the sound will escape. Of course, measures must be taken for the walls and floors, but don't forget the windows and doors of the room. They are relatively weak parts, and sound leaks out from these places. The sound insulation properties of room walls cannot be very high. If there is sound leakage, the first thing to pay attention to is the windows and doors.

Improve the sound insulation effect of the room 1

Sound insulation characteristics of high windows and doors

Sound insulation countermeasures for windows usually adopt double-layer window structures. You can keep the existing window and add another window; or you can remove the existing window and reinstall a single-layer window designed according to new standards. Both sides of the glass are the same thickness, and their resonant frequencies are the same. This will make sounds near that frequency stand out. Under normal circumstances, the distance between windows on two floors should be 20cm~30cm. To achieve the same -50dB sound insulation effect as a concrete wall, it is best to have a distance of more than 30cm between the two layers of glass. It would be better if some sound-absorbing measures could be taken during this interval. Properly constructed, the room can guarantee -50dB sound insulation properties.

The second weak link is the door. The worst sound insulation effects are the doors installed in ordinary collective apartments and simple home decorations; there is a large gap between the door and the door frame of a door made of rough plywood, and its sound insulation performance is no more than -15dB at most. The sound insulation characteristics of general residential doors can reach -25dB~-35dB. The iron doors with higher performance and those used in listening rooms are rarely seen in private houses. Nowadays, an increasing number of double-layer security doors have good sound insulation properties.

If you want to convert a plywood door into a soundproof door, you should consider that the soundproofing properties of the door must be consistent with the soundproofing properties of the wall. If the sound insulation performance of the room wall is only -30dB, installing a door with a sound insulation performance of -35dB will be suspected of excessive quality. Moreover, due to different manufacturers, there is a big difference in the price of -30dB and -35dB gates.

Price and cost are a very sensitive topic. Can you take some remedial measures yourself? If you want to improve the air tightness of the door by yourself, you can also paste some door seam tape or sponge. Since the distance between the door frames is relatively reduced, the sound insulation properties are somewhat improved.

As for how much the sound insulation properties can be improved, empirical data is generally no more than -3dB~-5dB. It's not that it has no effect at all. It's better to stick something on it than to leave a gap like before.

Improve the sound insulation effect of the room 2

Strengthen the sound insulation characteristics of the wall

As mentioned before, windows and doors are the weakest moving parts. The next work is Enhancements to the soundproofing properties of various walls. The load-bearing walls of ordinary residential buildings are made of steel plate concrete or solid brick structures, which have good sound insulation effects. The problem often arises from the light hollow bricks or gray plastic cardboard used in partition walls, which have sound insulation properties of only -25dB~-30dB. Most home theater rooms have one or two walls with this structure. There is no doubt that apart from windows and doors, this is the most serious place for sound leakage. If no measures are taken, the air vibrations in the middle of the hollow bricks will cause vibrations in the walls, which is very detrimental to the sound quality. There are two specific solutions: one is to tear down the original wall and build a new soundproof wall; the other is to retain the original wall and add a soundproof wall.

Both methods have their own advantages and disadvantages. The first method is to remove the original wall panels, install gray plastic cardboard on both sides, and stuff glass fiber in between. This solution will have good results. The second method is to retain the original partition wall and add a few new columns to form a sound insulation wall with glass fiber inside. This solution adds a new wall and has better sound insulation properties than The former option is better, however, it has the disadvantage of reducing the width of the room by several centimeters. In situations such as apartments where room space is limited, it may be appropriate to re-create soundproof walls.

If you are very concerned about the space of the room, choosing soundproof panels (lead sheets) available on the market is also a way. Compared with the first option mentioned above, this method costs less to achieve the same soundproofing effect. The cost is more than twice as high.

Improve the sound insulation effect of the room 3

Create a "room within a room"

The following is a truly qualified sound insulation strategy. To achieve true sound insulation, it is natural to implement sound insulation measures on the six sides of the room. If only a certain sound insulation performance is added to the walls (partition walls) of adjacent rooms, then the impact of the floor and ceiling on the sound will be prominent. . In order to prevent this from happening, a complete soundproofing method must be to take corresponding measures on all six sides of the room. To better improve the sound insulation characteristics of a room, it is necessary to create a room within the room, which is the so-called "room within a room" structure.

As the name suggests, "room within a room" means taking strict sound insulation measures on the four walls, floor, and ceiling. The final result is to construct a room inside the room. All recording studios are Use this structure. The sound insulation characteristics created in this way are higher than -50dB, which is even comparable to the ideal recording studio with sound insulation characteristics of -60dB~65dB. In order to completely isolate the inner and outer walls without transmitting any sound vibration, the "room within a room" structure must use isolation devices, and the construction is complicated. This level of soundproof wall does not allow installation gaps for sockets such as power supplies, audio equipment, telephones, air conditioners, etc. Therefore, when making actual plans, you should consult a large decoration company with corresponding experience. The manufacturing cost of a "room within a room" will be much higher than any of the previous renovation methods. Obviously, this is not something that the average salaried class can hope for. Sound insulation ultimately depends on the grade. You must have an idea of ??what standard your home theater must meet. Therefore, it is most important to take appropriate measures and spend the least amount of money to obtain a sound insulation effect that is commensurate with your financial ability and appreciation level