How to solve if the sound equipment has current sound?if the subwoofer has current sound

There are many situations that will cause noise in the sound, such as interference of the speaker, poor contact of the interface or connecting line, poor quality of the sound itself, and so on.
Generally speaking, most speakers are active speakers, and there must be amplifiers inside them, 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.
Caused by speaker problems
1, Electromagnetic interference can be divided into power transformer interference and stray electromagnetic wave interference.
2, Mechanical noise
Mechanical noise is unique to active speakers. During the operation 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 emitted by the fluorescent lamp ballast. Choosing good quality products is still the best way to prevent this noise. In addition, we can install a rubber damping layer between the transformer and the fixed plate.
3, 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 during rotation. If the screws of the speaker are not tightened and the inverter is not handled in place, mechanical noise will also be generated when playing large dynamic music.

Some sound environment changing methods that can be made by yourself.
Hang thick curtains
Thick curtains can also act as sound insulation. Make sure to use strong materials such as velvet, polyester or satin. Curtains made of these materials are actually designed for noise reduction.
Sound insulation pad box improves the sound quality and minimizes the noise of the floor. Generally, there is a moisture-proof layer, which is very important to protect your speaker from any moisture in the air that may damage the time. In addition to the obvious cost, one disadvantage of purchasing is that the off the shelf box lacks customization options, which means that it may not meet your needs. If you want to ensure that your box is completely suitable for your environment, you can create your own box using some 2 x 4, sound-absorbing panels and other sound insulation materials.

You can also plaster duct tape, painter’s tape, or gaffer tape across your speaker’s face to create a slight barrier against the sound. This is very easy to do, and tape is cheap and widely available. The main problem with this method is that if you leave pieces of tape on your speaker for too long and then try to peel it off, you may be left with some unpleasant residue from the glue.
If you combine these methods, you will enjoy your speakers while excluding their sounds from undesirable spaces.
Finally, these are temporary solutions that cannot stand the test of time. If you want to suppress speakers for a long time, you will need to invest more time, money and energy to do this.