在很多大型舞臺演出中，真 正震撼我們的并不是場面多宏達，而且現場的渲染力，而音響所發揮的效果則是功不可沒的。比較于室外的開放空間，在室內擺放各類音響時，為使其也能達到較好的音質效果，我們不僅要合理擺放不同類型的音響，而且也要學會做一些簡單的聲學處置。下面為大家介紹幾個減少室內音響回音現象的有效處置辦法：
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、鋪一塊厚實的地毯。地面對聲波的反射是為嚴重的。盡管地毯對低頻不大能起效果，但首要要辦的事便是設法吸收些高頻的反射。在直達聲之后頭5mS(毫秒)或稍后幾毫秒形成的早期反射，將會變成直達聲的一部分，又因它們多來自同一方向，因而便會讓人聽到。應當防止讓發聲純真的音箱去夾雜著發出些地面反射回來的高頻聲。又因為不大可能在天花板上加些軟襯墊，因此，如果不在地面上鋪陳以地毯，便會有兩個平行而且反射強的表面，聲波就將在地面與天花板之間來回地反射，從而讓聲響變得難聽。
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廳中，總是防止裝有反射的玻璃。在聽音室內，由于各面墻壁都離得很近，因之，玻璃所產生的反射聲很簡單會讓人感到厭煩。可以設法在窗戶上掛些可以拉開的窗布，在聆聽音樂時便拉上窗布。別的，不要在聽音室內擺放帶有玻璃前面板的書櫥和家俱。
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，皆有可能會產生無窮無盡的反射，從而呈現“多次回聲”，讓聲響變得難聽。可以用力拍擊雙手，如果聽到了回聲，便說明聽音室內有些問題。書架、尤其是亂七八糟隨意擺放些書籍的書架，作為聲波的分散器，便可以隔斷那些平行面的反射，盡管已有好些專門制作的聲分散屏出售，但在聽音室內擺放幾個書架便可以起到相當不錯的效果。
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”上粘貼些泡沫。除非聽音室的天棚猶如教堂那么高大，否則便應在音箱的每一高音單元的“鏡像反射點”粘貼些泡沫塊。所謂“鏡像反射點”指的是這樣的點：當將一面鏡子擺放在天花板上(或地面)的某個點時，能夠從聆聽位 置上看到鏡中的高音單元。盡管關于天花板的處置不必像對地面的處置那樣嚴格，但能夠作適當的處置仍然是很有好處的。當在天花板的鏡像反射點貼以厚度不過幾個毫米而面積不超過0.1m2的泡沫后，室內的聽音環境便已得到了改善。
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、不能讓混響過長。在鏡像反射點粘貼些小的泡沫塊并不會讓聽音室有過多的變化。但是，要是粘貼大塊的泡沫或是掛上相當厚實的窗布時，便會因為吸聲過多而讓重放出來的音樂聽來有死氣沉沉的感覺。薄而輕的吸聲材料將能很好地吸收高頻，但卻對低頻不起效果。通常，吸聲材料的厚度得大體上同聲波的半個波長相當，才會起到吸聲的效果。關于10kHz的聲波來說，波長僅3.4cm，因此，因厚度幾個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.
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