The woofer is composed of electromagnet, coil and horn film, which converts the current frequency into sound and physics. When the current passes through the coil, the electromagnetic field is generated. The direction of the magnetic field is the right-hand rule. Assume that the speaker plays C-tone, its frequency is 256Hz, that is, 256 vibrations per second, the speaker outputs 256Hz AC, 256 current changes per second, and emits C frequency. When the electric coil vibrates together with the speaker film, it pushes the surrounding air to vibrate, and the speaker produces sound.
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