IN-EAR CONCERT

摘要

A circuit called a crossover divides the audio signal into different frequency ranges and routes each batch to one of four speakers in the earphone.rnThe signal from the crossover enters a speaker and flows into a tiny copper coil, which responds with faint electromagnetic vibrations. Nearby, a small strip of metal, or armature, balances between the fields created by two magnets. The vibrations disrupt this magnetic field, causing the magnetized armature to pivot.