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In many large-scale stage performances, what really shocks us is not the scene, but the rendering power of the scene, and the effect of sound is indispensable. Compared with the outdoor open space, when placing all kinds of acoustics indoors, in order to achieve better sound quality effect, we should not only reasonably place different types of acoustics, but also learn to do some simple acoustic disposal. Here are some effective solutions to reduce indoor sound echo:

1、鋪一塊厚實(shí)的地毯。地面對(duì)聲波的反射是為嚴(yán)重的。盡管地毯對(duì)低頻不大能起效果，但首要要辦的事便是設(shè)法吸收些高頻的反射。在直達(dá)聲之后頭5mS(毫秒)或稍后幾毫秒形成的早期反射，將會(huì)變成直達(dá)聲的一部分，又因它們多來(lái)自同一方向，因而便會(huì)讓人聽(tīng)到。應(yīng)當(dāng)防止讓發(fā)聲純真的音箱去夾雜著發(fā)出些地面反射回來(lái)的高頻聲。又因?yàn)椴淮罂赡茉谔旎ò迳霞有┸浺r墊，因此，如果不在地面上鋪陳以地毯，便會(huì)有兩個(gè)平行而且反射強(qiáng)的表面，聲波就將在地面與天花板之間來(lái)回地反射，從而讓聲響變得難聽(tīng)。

1. Lay a thick carpet. The reflection of sound waves from the ground is very serious. Although the carpet has little effect on low frequencies, the first thing to do is to try to absorb some high-frequency reflections. The early reflections formed in the first 5ms (milliseconds) or a few milliseconds after the direct sound will become part of the direct sound, and they will be heard because they mostly come from the same direction. It should be prevented that the speaker with pure sound should be mixed with some high-frequency sound reflected from the ground. And because it is unlikely to add some soft padding to the ceiling, if you do not lay a carpet on the ground, there will be two parallel and highly reflective surfaces, and the sound waves will be reflected back and forth between the ground and the ceiling, making the sound ugly.

2、在窗戶上掛窗布在一些音樂(lè)廳中，總是防止裝有反射的玻璃。在聽(tīng)音室內(nèi)，由于各面墻壁都離得很近，因之，玻璃所產(chǎn)生的反射聲很簡(jiǎn)單會(huì)讓人感到厭煩?？梢栽O(shè)法在窗戶上掛些可以拉開(kāi)的窗布，在聆聽(tīng)音樂(lè)時(shí)便拉上窗布。別的，不要在聽(tīng)音室內(nèi)擺放帶有玻璃前面板的書(shū)櫥和家俱。

2. Hang window cloth on the window. In some concert halls, reflective glass is always prevented. In the listening room, because the walls are very close, the reflected sound generated by the glass is very simple and boring. You can try to hang some window cloth that can be opened on the window, and pull the window cloth when listening to music. In addition, do not put bookcases and furniture with glass front panel in the listening room.

3、設(shè)法破壞平行墻面的反射。平行的墻壁同地面和天花板一樣，皆有可能會(huì)產(chǎn)生無(wú)窮無(wú)盡的反射，從而呈現(xiàn)“多次回聲”，讓聲響變得難聽(tīng)?？梢杂昧ε膿綦p手，如果聽(tīng)到了回聲，便說(shuō)明聽(tīng)音室內(nèi)有些問(wèn)題。書(shū)架、尤其是亂七八糟隨意擺放些書(shū)籍的書(shū)架，作為聲波的分散器，便可以隔斷那些平行面的反射，盡管已有好些專(zhuān)門(mén)制作的聲分散屏出售，但在聽(tīng)音室內(nèi)擺放幾個(gè)書(shū)架便可以起到相當(dāng)不錯(cuò)的效果。

3. Try to destroy the reflection of parallel walls. Parallel walls, like the ground and ceiling, may produce endless reflections, presenting "multiple echoes" and making the sound ugly. You can clap your hands hard. If you hear an echo, there are some problems in the listening room. Bookshelves, especially those with random books, can be used as sound wave dispersers to block the reflection of those parallel planes. Although many specially made sound dispersion screens have been sold, placing a few bookshelves in the listening room can achieve quite good results.

4、在高音單元的“鏡像反射點(diǎn)”上粘貼些泡沫。除非聽(tīng)音室的天棚猶如教堂那么高大，否則便應(yīng)在音箱的每一高音單元的“鏡像反射點(diǎn)”粘貼些泡沫塊。所謂“鏡像反射點(diǎn)”指的是這樣的點(diǎn)：當(dāng)將一面鏡子擺放在天花板上(或地面)的某個(gè)點(diǎn)時(shí)，能夠從聆聽(tīng)位 置上看到鏡中的高音單元。盡管關(guān)于天花板的處置不必像對(duì)地面的處置那樣嚴(yán)格，但能夠作適當(dāng)?shù)奶幹萌匀皇呛苡泻锰幍?。?dāng)在天花板的鏡像反射點(diǎn)貼以厚度不過(guò)幾個(gè)毫米而面積不超過(guò)0.1m2的泡沫后，室內(nèi)的聽(tīng)音環(huán)境便已得到了改善。

4, paste some bubbles on the "mirror reflection point" of the treble unit. Unless the ceiling of the listening room is as big as a church, you should paste some foam blocks in the "mirror reflection point" of every sound unit of the loudspeaker. The so-called "mirror reflection point" refers to such a point: when a mirror is placed at a point on the ceiling (or ground), the tweeter in the mirror can be seen from the listening position. Although the disposal of the ceiling does not have to be as strict as the disposal of the floor, it is still beneficial to make appropriate disposal. When the mirror reflection point on the ceiling is pasted with a thickness of several millimeters and the area is no more than 0.1m2, the indoor listening environment has been improved.

5、不能讓混響過(guò)長(zhǎng)。在鏡像反射點(diǎn)粘貼些小的泡沫塊并不會(huì)讓聽(tīng)音室有過(guò)多的變化。但是，要是粘貼大塊的泡沫或是掛上相當(dāng)厚實(shí)的窗布時(shí)，便會(huì)因?yàn)槲曔^(guò)多而讓重放出來(lái)的音樂(lè)聽(tīng)來(lái)有死氣沉沉的感覺(jué)。薄而輕的吸聲材料將能很好地吸收高頻，但卻對(duì)低頻不起效果。通常，吸聲材料的厚度得大體上同聲波的半個(gè)波長(zhǎng)相當(dāng)，才會(huì)起到吸聲的效果。關(guān)于10kHz的聲波來(lái)說(shuō)，波長(zhǎng)僅3.4cm，因此，因厚度幾個(gè)厘米的泡沫便可以吸收高頻。

5. Don't let the reverberation be too long. Sticking small foam blocks at mirror reflection points will not cause excessive changes in the listening room. However, if you stick a large piece of foam or hang up a very thick window cloth, you will hear the sound of the replayed music because of excessive absorption. Thin and light sound-absorbing materials will be able to absorb high frequencies well, but they will not have an effect on low frequencies. Usually, the thickness of the sound-absorbing material must be roughly equal to half the wavelength of the sound wave to have the effect of sound absorption. As for the sound wave of 10kHz, the wavelength is only 3.4cm, so the foam of several centimeters thick can absorb high frequency.