It is best to check in the audio settings of the computer to see if the headphone output is selected. It is also best to set the volume and waveform to the middle position. The two positions are the same, and the line output is also the middle position. Of course there are It may be because the headphone cable is not shielded. The noise you hear is generally the sound emitted by alternating current, which happens to be at a frequency of 50HZ. If the headphone cable has no ground end, there must be hum. Just add a wire with a resistance close to 0 to the earphones and let the alternating current pass through this wire. Another possibility is that the problem is the power supply filter capacitor. The alternating current directly enters the amplifier circuit for amplification (listen with headphones to determine whether it is the sound of the chassis or the problem of the power amplifier).

Usually it is the filter capacitor in the power circuit. There is a problem, mainly because the open circuit cannot filter, causing the mains AC ripple to flow into the audio circuit and produce AC interference noise. The solutions: first, replace the filter capacitor, which is suitable for those who have a certain foundation in electronic circuits; second, take the speaker to the maintenance department for repair

Here I will give some comparisons. Specific troubleshooting methods:

1. First, connect the computer audio to the left and right channels (red and white lotus plugs) on the subwoofer and plug them into each other, and then listen to see if the original speaker is still there. noise. ?

A. If there is no noise but there is noise from the other speaker, it means there is something wrong with the audio cable. Solution: Replace the audio connection cable from the computer to the subwoofer. ?

B. If there is still noise, it means it is not a problem with the audio cable. Please read on. ?

2. Exchange the cables connecting the subwoofer to the two small speakers, and then listen to see if there is still noise from the original speaker. ?

A. If there is no noise but there is noise from the other speaker, it means there is a problem with the internal circuit or circuit of your subwoofer. It is recommended to find someone to open the subwoofer and check whether the internal circuit or circuit is faulty. Welding, capacitor or a part is damaged. ?

B. If there is still noise, it means there is a problem with the speaker connection cable, or there is a problem with the small speaker itself. ?

3. You can use headphones to listen to see if there is any noise. If there is noise from one of them, it means there is a problem with the computer sound card hardware or software, and you can rule out the problem with the speakers. ?

If there is no noise when listening with headphones, it can be determined that there is a problem with the computer's external sound reinforcement equipment, that is, there is a problem somewhere between the audio connection cable and the two small speakers. ?

Don’t worry, you can definitely find the problem by using the elimination method. ?

Additional instructions: ?

1. Do not place mobile phones, radio receivers, transmitters and other radiation interference equipment near subwoofers and small speakers. ?

2. Do not use the same power strip for the subwoofer and other high-power electrical appliances at the same time to avoid unstable voltage and insufficient current that may interfere with or damage the speaker.

I hope this can help you and help you solve your current problems, so that there will be no more electric current sounds. I support you, I believe it will be solved, don’t worry.