If so, there will generally be a large electric sound.

The subunit (especially the subwood) has a large power consumption ratio. That is, most of the supply of the horn line goes to the bass unit. So, when you turn off the bass, the current is much less, and the sound of the current is naturally much less.

Different frequency requirements of the circuit is not the same, so the equipment supply current is time-dependent. After a period of warm-up, the acoustic and electrical parameters of each circuit element have changed. So turn on for a while to have apparent current sound is also a normal phenomenon.

It is difficult to eliminate the sound of electric current. You can first open each case to analyze the circuit. Try to make the units complement each other.

If there is no current sound (actually a kind of thermal noise) after the pause, there is a problem with the sound source, or the sound card. This kind of noise is unavoidable, only has the size to divide. You can also turn up the volume of the speaker and unplug the audio input line. If there is still noise, it is the speaker problem. This noise cannot be solved.

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