Why does the speaker make a current sound?

Part1: Mechanical noise

Mechanical noise

Mechanical noise is unique to active speakers. During the operation of the power transformer, the vibration of the iron core caused by the alternating magnetic field will produce mechanical noise, which is very similar to the buzzing sound emitted by the fluorescent lamp ballast. Choosing good quality products is still the best way to prevent this noise. In addition, we can add a rubber shock-absorbing layer between the transformer and the fixed plate.

Part2: Hot dry

Hot dry

If the potentiometer is used for a long time, dust accumulation and wear will occur between the metal brush and the diaphragm. Problems such as poor contact may cause noise when rotating. If the screws of the speaker are not tightened and the inverter tube is not properly processed, mechanical noise will also be produced when playing large dynamic music.

This kind of thermal noise can be dealt with by replacing low-noise components or reducing the component workload. In addition, lowering the operating temperature is also one of the effective methods.

Part3: Electromagnetic interference

Electromagnetic interference

Electromagnetic interference can be mainly divided into power transformer interference and stray electromagnetic wave interference. The interference of the power transformer is caused by the magnetic leakage of the power supply of the multimedia speaker. When conditions permit, the effect of installing a shielding cover on the transformer is very obvious, which can block the magnetic leakage to the greatest extent. The shielding cover can only be made of iron-type materials.

Spurious electromagnetic wave interference is relatively common, and speaker wires, crossovers, wireless devices or computer hosts can all become sources of interference. Place the main speakers as far away from the computer host as possible and reduce peripheral wireless devices.