As we all know, the influence of acoustic environment on the playback effect of sound system is far greater than that of any other sound equipment. Although there are many ways to improve the acoustic environment, too much processing environment will destroy the work. Just let the sound spread out, which can spread the sound in all directions and prevent the echo from appearing. However, if the room is full of scattering surfaces, it will make the stereo image positioning worse, the sound will spread in all directions, and it will not be accurately focused into an image. The following small series of Jiangsu Mars Stage Technology Co., Ltd. introduces several effective solutions to reduce the echo phenomenon of indoor sound:
1, lay a thick carpet.
Sound waves are most seriously reflected on the ground. Although the carpet has little effect on low frequency, the first thing to do is to absorb some high frequency reflections as much as possible. Early reflections formed in the first 5mS (milliseconds) or several milliseconds after direct sound will become a part of direct sound, and people will hear them because they mostly come from the same direction. We should prevent pure-tone speakers from emitting some high-frequency sounds reflected from the ground. Because it is impossible to add some soft fillers to the ceiling, if there is no carpet on the floor, there will be two parallel highly reflective surfaces, and sound waves will reflect back and forth between the floor and the ceiling, thus making the sound ugly.
2. Hang curtain cloth on the window.
In some concert halls, reflective glass is always blocked. In the listening room, because all the walls are close to each other, the reflected sound produced by the glass is very simple and will make people feel bored. You can try hanging some window cloths that can be pulled open on the window, and pull the window cloths while listening to music. In addition, don't put bookcases and glass front panel furniture in the listening room.
3. Try to destroy the reflection of the parallel wall.
Parallel walls, such as floors and ceilings, may produce endless reflections, thus presenting "multiple echoes" and making the sound ugly. You can clap your hands hard If you hear an echo, there is something wrong with the listening room. Bookshelves, especially bookshelves with books placed at random, can act as sound wave diffusers to block the reflection of those parallel planes. Although there are many specially made sound screens for sale, putting a few bookshelves in the listening room can also achieve quite good results.
4. Stick some foam on the "specular reflection point" of the tweeter.
Unless the ceiling is as high as a church, you should stick some foam blocks on the "mirror reflection point" of each high-pitched unit of the speaker. The so-called "specular reflection point" refers to the point where the high-pitched unit in the mirror can be seen from the listening position when a mirror is placed at a certain point on the ceiling (or ground). Although the disposal of the ceiling is not as strict as that of the ground, it is still very beneficial to be able to dispose of it properly. Comparing figure 1 with figure 2, it can be seen that the indoor listening environment has been improved after the foam with a thickness of only a few millimeters and an area of no more than 0. 1m2 is pasted on the mirror reflection point of the ceiling.
5, can't let the reverberation time is too long
Sticking some small foam blocks on the mirror reflection point will not change the listening room much. However, if you stick a large piece of foam or hang a fairly thick curtain cloth, the reproduced music will sound lifeless because of too much sound absorption. Lightweight sound-absorbing materials can absorb high frequencies well, but have no effect on low frequencies. In general, the thickness of sound-absorbing materials should be roughly equivalent to half a wavelength of sound waves to achieve sound absorption. As for the sound wave of 10kHz, the wavelength is only 3.4cm, and the foam with a thickness of several centimeters can absorb high frequency.