电磁干扰主要可以分为电源变压器干扰和杂散电磁波干扰。
Electromagnetic interference can be mainly divided into power transformer interferences and spurious interference of electromagnetic wave.
一般来说，电源变压器干扰是由于多媒体音箱的电源漏磁造成的，在条件允许的情况下为变压器加装屏蔽罩的效果非常明显，可以最大程度的将漏磁阻挡，屏蔽罩只能用铁型材料制作。我们应该尽量选择大品牌、用料扎实的产品，另外，使用外置变压器也是个不错的解决办法。杂散电磁波干扰比较常见，音箱导线、分频器、无线设备或者电脑主机都会成为干扰源。将主音箱在允许条件下尽量远离电脑主机，并且减少周边无线设备。机械噪音是有源音箱特有的。电源变压器在工作过程中，交变磁场引起的铁芯震动就会产生机械噪音，这很类似于日光灯镇流器所发出的嗡嗡声。选择质量好的产品仍然是预防这种噪音的最好办法。另外，我们可以在变压器和固定板之间加装橡胶减震层。
Generally speaking, the power transformer interference is due to magnetic leakage power due to the multimedia speaker, in the conditions allow for the transformer is additionally provided with a shield cover the effect is very obvious, can be the greatest degree of the magnetic flux leakage barrier, shield can only be made of iron material. We should try to choose a big brand, with solid products, in addition, the use of an external transformer is also a good solution. Stray electromagnetic wave interference is relatively common, speaker wire, frequency divider, wireless device or computer host will become the source of interference. The main speakers in the permit conditions as far as possible from the host computer, and reduce the surrounding wireless equipment. Mechanical noise is the active speaker special. Power transformer in the work process, the core of alternating magnetic field caused by vibration will produce mechanical noise, this is very similar to the emitted fluorescent lamp ballast hum. Selection of good quality products are still the best way to prevent this kind of noise. In addition, we can install rubber between transformer and a fixing plate damping layer.
电位器长时间使用
The potentiometer is used for a long time
还有一点应该注意一下，如果电位器使用的时间较长，金属刷与膜片之间就会因灰尘堆积和磨损等问题产生接触不良，旋转时就会产生噪声。如果音箱的螺丝没有旋紧，倒相管处理不到位，在播放大动态音乐时，也会产生机械噪音。处理这种热噪声可以通过更换低噪声元件或是降低元件工作负荷的方法，另外，降低工作温度也是也是行之有效的方法之一。
Another point should be noted, if the potentiometer using a long time, between the metal brush with the diaphragm will because of the problem of dust accumulation and wear resulting in poor contact, the rotating will noise. If the speaker screw is not tightened to the inverted tube processing does not reach the designated position, in the complex music, also can produce mechanical noise. To deal with this thermal noise can be replaced by low noise components or is a way to reduce work load, element in addition, one of the methods to reduce the working temperature is also effective.
音量调得过大
The volume is too large
另外，有些电脑音箱，当音量调得过大，也会出现噪音。这种情况是因为功放输出功率可能较小，不能避开音乐瞬间的大动态峰值信号造成的或者是因为由于喇叭过载失真造成。

In addition, some computer speakers, when the volume is too large, will also appear the noise. This is because the power amplifier output power may be relatively small, can not avoid the high dynamic signal caused by momentary peak music or is because overload distortion caused by speaker.

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