1, Nandaqian sound recovery

Free door-to-door recycling enjoys a good reputation in the industry, mainly in Europe, America and Japan, and the price is higher. It belongs to a large professional recycling company in Guangzhou. Started with recycling audio, and later developed into sales, leasing, installation and other perfect services, giving a five-star.

2. New lighting and sound recycling in the north

Free door-to-door recycling, recycling price is high, but only Beijing free door-to-door recycling, mainly in Europe and America, relatively large scale, good service, comprehensive service score of four stars.

Horn sounding principle

A very important piece of equipment in a sound system is a sound box, which generally consists of a speaker unit and a box. The speaker unit is used as a sound generating part, and the box is used as a supplement to the speaker unit to correct the sound.

The sound generation principle of the horn unit is the conversion from electric energy to sound. When different electric energy is transmitted to the coil, the energy generated by the coil interacts with the magnetic field of the magnet to make the paper tray vibrate.