Electrophones are instruments where sound is created through a mechanical device.

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Electrophones are defined by using electrical energy to generate sound, which is then turned into audible waves by a mechanical transducer. In practice, the actual sound you hear comes from a vibrating membrane, like a speaker diaphragm, that converts the electrical signal into sound. That makes vibrating membranes the best description here, since the mechanical device responsible for producing the audible sound is the membrane. The other options point to the instrument’s own vibrating elements (strings, traditional membranes, or air columns) used in purely acoustic instruments, not the electronic-to-sound conversion step found in electrophones.