Dynamic headphones: This is the most common form of headphones. The coil is fixed on the diaphragm, placed in a fixed magnetic field generated by the permanent magnet, and the signal is cut by the coil to cut the magnetic line, thereby causing the diaphragm to vibrate together. The advantage is that the production is relatively easy; the linearity is good, the distortion is small, and the frequency response is wide. The disadvantage is that it is inefficient.
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