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A basic capacitor works as two parallel plates carrying opposite charges and have an electrostatic force holding the charges in place (without making any contact); can't an electrostatic loudspeaker be considered a capacitor since it works by having a charged diaphragm between two plates of opposite charge?

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Yes, an electrostatic speaker is a capacitor. From the Wikipedia article "Electrostatic loudspeaker":

The electrostatic construction is in effect a capacitor, and current is only needed to charge the capacitance created by the diaphragm and the stator plates

There are, as you might expect, microphones that are essentially capacitors too.

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