Concert Hall Sound-absorbing Acoustic Design

The indoor sound absorption degree of the sound absorption and acoustic design of the concert hall is expressed by the sound absorption power or the average sound absorption rate. The sound absorption power is expressed by dividing the sound absorption rate of the material by the use area of the material, and the average sound absorption rate is due to When the difference in the material such as the wall or the ceiling is caused by the difference in the sound absorbing rate, the total sound absorption after the respective sound absorbing power is divided by the total area is expressed. The task of sound absorbing in the sound insulation plan is to absorb noise so as not to affect other aspects. For example, when the sound absorbing material is placed around the noise generating source, the noise level can be lowered; or when the sound absorbing material is used on the wall of the room, the noise can be lowered. Noise from intrusion from the outside. However, it should be noted that the sound insulation effect cannot be achieved only when the sound absorbing material is used. For example, on the side where the window is opened, since the sound energy that it hits is not reflected, the sound absorption rate is 100, that is, the surface is a sound absorbing surface, but there may be a surface that cannot be soundproofed. When the indoor sound absorption level is large, it can suppress the diffused sound in the room and reduce the noise level. This method is effective when it is far away from noise sources and influence points, but if there are noise sources everywhere in the room and the distance from the influence point is similar, for example, the seat at the window handles the sound of window intrusion because the direct influence of noise is too large. Therefore, the sound insulation effect by sound absorption is not too significant. 

Stage port of concert hall sound-absorbing acoustic design 

The stage entrance of the concert hall plays an important role in getting the early reflection sound of the seats in front of the pool in the hall. The reflective surface of the front wall and roof panel of the front of the table should be designed for the reflective sound obtained in the center area of the front of the pool, which is irreplaceable by other interfaces in the hall. 

Gallery and balcony railings

Concert halls usually take into account both natural sound and amplified performances, with the sound source in two different positions on the stage (natural sound) and the upper sound bridge (the speaker group of the loudspeaker system) on the platform, and the concert hall is sound-absorbing. The floor panels are usually concave. Concert hall sound absorption. Therefore, the diffuse design should be done on the barboard, the form can be used in the shape of convex curved round hanging surface, triangle shape, cone and so on. 

Ceiling under the balcony

The seats under the building are usually far away from the stage. In order to obtain a uniform sound field distribution, under the condition of natural sound performance, flowering should play a role in strengthening the sound intensity of the back seat; when using sound reinforcement, the ceiling should make the speaker group The sound smoothly entered the space under the building.

The back wall of the music venue 

The decoration of the back wall of the concert hall depends on the function of the hall and the way of performance. For the concert hall and the opera house where the natural sound is performed, the back wall should be reflected and diffused, and the hall with the sound reinforcement system can use the sound absorbing structure, and at the same time prevent the echo group and the speaker group. The finish construction is required to meet both sound and aesthetic requirements.

（1) The finish structure must have as large a transmission rate as possible, not less than 50%

 (2) Lining horn cloth should be as thin as possible to avoid affecting the output of high-frequency sound

 (3) The structure must be rigid enough to cause resonance.

 (4) When using a wooden grille finish, the width of the strip should not be greater than 50mm, so as not to block the output of high-frequency sound