The sound from the sound source in the room is transmitted to the listener's ear through six channels, the direct sound of 1 speaker, the reflection of 2 floors, the reflection of 3 ceilings, the reflection of the back wall of 4 speakers, 5 The reflection of the walls on both sides, 6 the reflection of the wall behind the listener. As long as any reflection condition of the sound wave is changed, the sound changes. The intensity of the reflected sound must be appropriate.
The wall of the general room in our country is a rigid wall parallel to each other, and the height is below 3m. For a room of about 16m2, resonance is easy to occur in the low frequency band, so that the sound of a certain frequency is abnormally enhanced, causing the bass roaring and seriously affecting. The quality of the reproduced sound, which is the most common problem in home listening rooms. This kind of room resonance also makes the sound distribution of some frequencies (mainly low frequency) very uneven in space. The frequency at which the possibility of acoustic dyeing is greatest is 100 to 175 Hz, and around 250 Hz.
Acoustic treatment of the room, focusing on the side walls and ceiling. In principle, indoor sound waves should be treated more diffusely than absorbed, in order to reduce the resonance intensity, and to prevent excessive use of sound absorbing materials, so as to avoid the room's reverberation time is too short (< 0.3 seconds) to make the sound dry and not round. For the wall behind the speaker, it is best not to have a large piece of sound-absorbing material, usually no need to deal with it, brick wall or cement wall will make the sound full and full of vitality.
The side wall can evenly and appropriately set some sound absorption and diffusion materials. For example, a thick wool blanket is an excellent full-frequency sound absorbing object, and the thin carpet and the tapestry only absorb the medium and high frequency. The wooden doorless bookcase is a good sound diffuser, which is good for adjusting the low frequency. In addition, furniture such as tables, chairs, mattresses, sofas, etc. can adjust the sound transmission and can be used as an acoustic treatment. The most ideal acoustic treatment is to put a suitable diffuser on the side wall, but it is expensive and affects the appearance, which is difficult for the general family to accept. The convex arc is a good device for sound diffusion and sound absorption, and can be suitably used. In the sound absorbing process, the lower half of the wall is more important than the upper half, and can be treated with a resonant sound absorbing structure such as a perforated plate or a thin plate.
Thin carpets, curtains, tapestries, etc. mainly absorb the middle and high frequencies, and have little effect on the low frequency sound absorption. Too much use will cause the reverberation time of the medium and high frequency sounds in the room to be short, making the sound Lack of color, not bright enough. Wooden boards and other wooden boards can effectively absorb low frequencies, but there should be appropriate gaps between the walls and the walls when necessary. If necessary, place sound-absorbing materials in between. But remember not to nail a lot of splints to the wall, and don't put a lot of sound-absorbing blankets and curtains in the room. Otherwise, because the high frequency is absorbed a lot, it will cause the sound to dry, the details are reduced, and the volume is reduced.
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