造成回声的原因很多，一是室内扩声环境设计不合理，二是音箱布置不合理，叁是音响设备和音响系统调试不好。具体包括以下四个方面：
There are many reasons for echo, one is the unreasonable design of indoor sound reinforcement environment, the other is the unreasonable layout of speakers, and the third is the poor debugging of sound equipment and sound system. Specifically, it includes the following four aspects:
(1)麦克风直接放置在扬声器的辐射区，其轴心与扬声器直接对齐。
(1) The microphone is directly placed in the radiation area of the speaker, and its axis is directly aligned with the speaker.
（2）扩声环境中声反射现象严重，周围和天花板没有用吸声材料装饰。
(2) Sound reflection is serious in the sound reinforcement environment, and the surrounding and ceiling are not decorated with sound-absorbing materials.
(3)音响设备匹配不当，信号反射严重，连接线虚焊，声音信号流过时接触点。
(3) The sound equipment is mismatched, the signal reflection is serious, the connecting wire is faulty, and the sound signal flows through the contact point.
(4)部分音响设备处于临界工作状态，声音信号较大时出现振荡。
(4) Some audio equipment is in critical working state, and oscillation occurs when the sound signal is large.
声反馈是
舞台音响扩声中的一个令人头疼的问题。无论是在剧院、场馆还是歌舞厅，一旦发生声反馈，不仅会破坏整个音响系统的正常工作状态，破坏音质，还会破坏会议、演出效果。因此，声反馈的抑制是扩声系统调试和应用过程中必须注意的一个极其重要的问题。音频工作者应该了解声反馈并找到更好的方法来避免或小化由声反馈引起的啸叫。.
Acoustic feedback is a headache in stage sound reinforcement. Whether in theatres, venues or song and dance halls, once acoustic feedback occurs, it will not only destroy the normal working state of the entire sound system, destroy the sound quality, but also destroy the effect of meetings and performances. Therefore, the suppression of acoustic feedback is an extremely important problem that must be paid attention to in the debugging and application of sound reinforcement system. Audio workers should understand acoustic feedback and find better ways to avoid or minimize the howling caused by acoustic feedback
另外，如果一个音响系统中有很多不同类型的音箱，确实没有电子分频器，而且不同类型的音箱使用的是全频信号，没有分频，那么不同的音箱之间会有很多的频率迭加和重复。扬声器。在该部分，声学干扰也会变得很严重，声音会变得模糊，声场很差，麦克风容易出现声反馈。
In addition, if there are many different types of speakers in a sound system, and there is no electronic frequency divider, and different types of speakers use full frequency signals without frequency division, there will be a lot of frequency superposition and repetition between different speakers. Speakers. In this part, the acoustic interference will also become very serious, the sound will become blurred, the sound field is very poor, and the microphone is prone to sound feedback.
如果使用电子分频器进行合理的分频，使不同的扬声器处于良好的工作状态，使不同扬声器之间的声音频率范围几乎不会重复，从而减少声波相互干扰的现象。声音会变得格外清晰，音色会更好，更有层次感！
If the electronic frequency divider is used for reasonable frequency division, different loudspeakers will be in good working condition, and the sound frequency range between different loudspeakers will hardly repeat, so as to reduce the mutual interference of sound waves. The sound will become particularly clear, and the timbre will be better and more layered!
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