Horn Magnet: Provides a permanent magnetic field for the horn coil and is built into the speaker cone. As 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 tiny magnetic field will be the permanent magnet field generated by the magnet repellent or attract. This speaker cone will be far away 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 that you get the audio waveform that matches the audio signal. Only the front of the horn magnet (that is, where the speaker cone) magnetic field is applicable. The magnets field generated on the back of the magnet is useless, you can stick this side on the refrigerator. Usually neodymium-iron-boron magnets and ferrite magnets are used as horn magnets.