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Generally speaking, the speakers are mostly active speakers, and there must be an amplifier inside, so the noise is unavoidable. The noise of the active speakers can be roughly classified into electromagnetic interference, mechanical noise and thermal noise. 
First, electromagnetic interference Electromagnetic interference can be mainly divided into power transformer interference and stray electromagnetic interference.
1. Power transformer interference Due to the magnetic leakage of the multimedia speaker, the effect of adding a shield to the transformer is very obvious when conditions permit. It can block the magnetic leakage to the greatest extent. The shield can only be made of iron material. . We should try our best to choose big brands and solid materials. In addition, using external transformers is also a good solution.
2, stray electromagnetic interference is more common, speaker wires, crossovers, wireless devices or computer hosts will become interference sources. Keep the main speakers as far as possible from the host computer and reduce peripheral wireless devices.
Second, mechanical noise Mechanical noise is unique to active speakers. During the working process of the power transformer, the iron core vibration caused by the alternating magnetic field will produce mechanical noise, which is very similar to the buzzing sound of the fluorescent lamp ballast. Choosing a good quality product is still the best way to prevent this noise. In addition, we can add a rubber shock absorber layer between the transformer and the fixed plate.
Third, thermal noise If the potentiometer is used for a long time, there will be poor contact between the metal brush and the diaphragm due to dust accumulation and wear, and noise will be generated when rotating. If the speaker's screws are not tightened, the inverted tube is not handled properly, and mechanical noise is also generated when playing large dynamic music.
In addition, some computer speakers, when the volume is adjusted too large, there will be noise. This situation is because the power output of the power amplifier may be small, it cannot be avoided by the large dynamic peak signal of the music moment, or because the sound of the speaker is caused by many kinds of situations, such as the speaker is disturbed, the interface or the connection line is poorly connected, and the speaker The quality itself is poor and so on.
Other problems lead to:
1. The card is not properly separated from the expansion slot of the motherboard. After visually, the “golden finger†and the extended slot spring on the sound card are misaligned. This phenomenon is common on ISA cards or PCI cards. It is a common problem. If you want the method to insert the sound card, you can handle the problem.
2. The active speaker input terminal is connected to the speaker output of the sound card. The active speaker should be connected to the Line-Out end of the sound card. The output signal is not amplified by the sound card, and the noise is much smaller. Some sound cards only need one output, Line-Out or Speaker depends on the jumper resolution on the card. The default mode is often Speaker, so if you need it, you have to unplug the sound card to adjust the jumper.
Q: How can I eliminate these currents?
A: It is recommended to use the exclusion method:
1. First plug the computer audio into the left and right channels (red and white lotus plugs) on the subwoofer, and then listen to the original speaker and there is no noise.
A. If there is no noise and the other speaker is noisy, it means that there is a problem with this audio cable. Solution: Replace the computer's audio cable to the subwoofer.
B. If there is still noise, it means that it is not an audio cable. please watch the following part.
2. Intersect the connection line connecting the subwoofer to the two small speakers, and then listen to the original speaker and there is no noise.
A. If there is no noise and the other speaker is noisy, it means that there is a problem with the internal circuit or circuit of your subwoofer. It is recommended to find someone to open the subwoofer, check the internal circuit, whether the circuit has any solder joints, whether the capacitor or a part is Damaged.
B. If there is still noise, it means that there is a problem with the speaker cable, or the small speaker itself has a problem.
3, you can listen to it with headphones to see if there is noise. If there is only noise, it means that there is a problem with the computer sound card hardware or software, you can eliminate the speaker problem.
If you don't hear noise with your headphones, you can be sure that there is a problem with the external sound reinforcement device of the computer, that is, from the audio cable to a problem between the two small speakers. Don't worry, you can find the problem by using the exclusion method.
Additional information:
1. Do not put radiation interference devices such as mobile phones, radio receivers, transmitters, etc. near the subwoofer and small speakers.
2. The power supply of the subwoofer should not be used with other high-power electrical power supplies at the same time to avoid voltage instability, insufficient current and interference, and damage the speaker.
So many years of audio tuning experience are here!