The dynamic earphone is the most common earphone. Its driving unit is basically a small dynamic ring speaker, which is driven by a voice coil in a permanent magnetic field to vibrate the diaphragm connected to it. The dynamic earphones are relatively efficient, and most of them can be driven by the headphone output of the audio, and are reliable and durable. Generally speaking, the larger the diameter of the drive unit, the better the performance of the earphone. At present, the maximum diameter of the drive unit in the consumer-grade earphone is 70mm, which is generally the flagship earmuff type earphone.
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