The main speaker treble has a murmur

Generally speaking, the audio is more active speakers, its internal amplifier will certainly exist, so the noise is inevitable, the noise of active speakers can be roughly divided into electromagnetic interference, mechanical noise and thermal noise according to the source.

Electromagnetic interference can be divided into power transformer interference and stray electromagnetic wave interference. Generally speaking, the power transformer interference is due to the multimedia speaker power leakage caused by the conditions allow the transformer installed shielding cover is very effective, can maximize the leakage of magnetic blocking, shielding cover can only be made of iron-based materials. We should try to choose a big brand, solid material products, in addition, the use of external transformers is also a good solution.

Stray electromagnetic interference is more common, speaker wires, crossovers, wireless devices or computer hosts can be a source of interference. Keep your main speakers as far away from your computer as possible, and minimize the amount of wireless equipment in the vicinity.

Mechanical noise is unique to active speakers. The vibration of the iron core caused by the alternating magnetic field of the power transformer during operation produces mechanical noise, which is very similar to the humming sound made by fluorescent light ballasts. Choosing a good quality product is still the best way to prevent this noise. In addition, we can add a rubber damping layer between the transformer and the fixed plate.

One more thing that should be noted is that if the potentiometer is used for a long time, poor contact between the metal brushes and the diaphragm will be produced due to problems such as dust buildup and wear and tear, and noise will be produced when it is rotated. If the speaker's screws are not screwed tightly and the inverting tube is not handled properly, it will also produce mechanical noise when playing loud dynamic music.

To deal with this kind of thermal noise can be through the replacement of low-noise components or reduce the component workload method, in addition, reduce the operating temperature is also one of the effective methods.

Additionally, when the volume is set too high, noise can also occur. This is because the amplifier output power may be small, can not avoid the music moment caused by the large dynamic peak signal or because of the speaker overload distortion caused.

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I hope the answer can help you