Hornbostel - Sachs
Electro-acoustic instruments and devices
Electrical signals are passed to a loudspeaker to produce sound. The signals are produced using materials that generate acoustic sound, or by mechanically driven signal sources. Modules and configurations of acoustic, vibratory mechanisms and electronic circuitry such as transducers and amplifiers. The acoustic or mechanical vibration is transduced into an analogue fluctuation of an electric current. Material vibrates mechanically owing to its solidity and elasticity to provide input to a transducer (pick-up).
Electro-acoustic idiophones