There are actually three steps in the home theater audio-visual room renovation: first, the slotted wiring is fixed, then the base layer is processed, and the final layer is processed. However, many high-rise users of non-basement home theater environments will encounter problems that disturb people. So how to solve the problem of noise reduction? Today, Xiaobian will explain in detail how to do the grassroots treatment of the home theater. Or directly, today we talk about how to create elastic shear walls.
What is an elastic shear wall?
The elastic shear wall is a wall structure constructed by elastic shearing parts and various soundproofing materials and decorative plates. His main role is sound insulation and low frequency absorption.
We know that sound propagation has two paths: air transmission (wall and gap) and structural sound (rigid structural connection). Sound insulation is to block the spread of sound. To reduce the sound of air, one is to increase the sound insulation of the wall, and the other is to seal the gap. To reduce the structure of the sound, you need to cut off the way the sound solids are transmitted (sound bridge). The unique elastic damping characteristics of the shock-damping sound insulator used to create the elastic shear wall, together with the corresponding sound-insulating structure, are specially treated for these two types of sound propagation modes, effectively improving the sound insulation performance of the room.
Three characteristics of elastic shear wall
1. The vibration-damping sound insulator and the cover plate form an elastic structure—the low-frequency sound energy transmitted to the wall is converted into heat energy by the vibration of the elastic structure, which greatly improves the low-frequency sound insulation performance.
2. Cut off the sound bridge – the wall, top surface and floor structure of the suspended structure can cut off the physical conduction of sound.
3, the closed cavity - in terms of the leakage of the gap, on the other hand, constitutes a thin plate resonant sound absorption structure, with the characteristics of low frequency absorption.
In fact, the elastic shear structure is mainly the low frequency part of the processed sound, and the medium and high frequency is treated by the sound insulation felt in the multilayer structure. The sound insulation felt (the sound insulation felt should use large brands or high-end imported products to avoid formaldehyde pollution) and the plate to block the air, and the elastic shearing members block the structural sound transmission caused by the rigid structure connection.
The two materials involved are the shock absorbing parts and the second is the shock keel. The shock absorbing parts are composed of two-sided hardware and tight rubber, which completely eliminates the safety hazard caused by rubber life. Rubber as a medium completely eliminates the rigid connection between the shock keel and the wall. This shock absorbing structure is 100% metal-free and eliminates resonance noise.
The hardware is made of 2mm stamped steel with a thickness of 2mm. The surface is nickel-plated and has good rust resistance.
The rubber parts are molded by a new material NR modified formula, which has good softness and long service life.
Shock absorbing keel is rolled by Q195 galvanized steel strip
The shock keel thickness is 0.45 thick and 0.60 thick.
0.45 thick keel on the wall, 0.60 thick keel on the ceiling and ground
Shock absorber size (HWD): 100 mm * 26 mm * 30 mm
Shock keel length: 2500 mm
Construction sequence:
First, the top surface, the ground, the opposite side wall, and the other two side walls, six sides of the "room in the room" elastic shear structure is formed.
The sound insulation strength and thickness of the shear wall are controllable. The most conventional structure can be seen in the figure below.
This is the most basic structure. For particularly demanding, it can be further evolved in the wall and wooden keel to create a soundproof + shock absorbing wall.
For example, first hit the wooden keel, put high-density fiberglass cotton and then seal the board.
A sound insulation felt is added to the board, and the shear structure is added.
The wall keel can be made 50cm apart, and if it is the ground, it must be 30cm. A shock keel length is 2.5m, and every 50cm, it is equipped with a shock absorber.
If you want to reinforce the compartment in the middle and high frequency sections, you can also attach the soundproof mat to the place in the structure below.
In addition, if you use gypsum board directly on the periphery of the shear structure, your structure will be abandoned for two reasons:
First: gypsum board is a lightweight material with low density and poor sound insulation. Here, a material with a high density and a large weight is used, which is similar to a calcium silicate board (cement board).
Second: Since the gypsum board is very light, his resonance frequency will become higher when used in conjunction with the elastic structure. The original shear structure can be used to absorb the extremely low frequency part, so that the frequency band that is processed will also change, which is highly undesirable.
The processing at the grassroots level has arrived here today. For the base surface to complete the full surface, you can treat it as a normal home decoration. The paint is painted and the wallpaper is wallpapered. Of course, the above is mainly the sound insulation treatment of the home theater audio-visual room. As for the sound-absorbing diffusion and other acoustic transformation It's a different matter, you can look at it from here: "From entry to proficient home theater knowledge one-stop navigation."
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