When the changing current is fed into the sound, the magnet becomes an electromagnet. The current direction changes constantly, and the electromagnet keeps moving back and forth due to the “force movement of the energized wire in the magnetic field”, driving the paper basin to vibrate back and forth. The stereo has sound.
The magnets on the horn mainly include ferrite magnet and NdFeB magnet. According to the application, NdFeB magnets are widely used in electronic products, such as hard disks, mobile phones, headphones and battery powered tools. The sound is loud.