Horn magnet: Provides a permanent magnetic field for the horn coil and is built into the speaker cone. When the audio signal passes through the horn coil, it produces a small amount of magnetic field that varies with the intensity of the audio signal. This small magnetic field will repel or attract the permanent magnetic field generated by the horn magnet. This way the speaker cone will stay away from and close to the back of the lama. So as the intensity of the audio signal changes, the speaker cone moves back and forth, so you get the sound waveform that matches the audio signal. Only the magnetic field in front of the horn magnet (that is, where the speaker cone is located) is suitable. The magnetic field generated on the back of the magnet is useless.
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