A loudspeaker driver is a dynamic microphone run backwards — same magnet, same coil, same diaphragm, opposite direction. What surrounds it decides almost everything you actually hear.
A moving-coil loudspeaker is the same machine as a moving-coil microphone with the energy flowing the other way. In the microphone, air moves a diaphragm attached to a coil sitting in a magnetic field, and a voltage appears. In the speaker, a voltage drives current through a coil sitting in a magnetic field, the coil is forced to move, and it pushes air.
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