Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Sound Devices (hierarchy name)
5. sound devices (equipment)
6. [sound devices by acoustical characteristics]
7. electrophones
8. electronic instruments

Anotations

Scope note:

Electronic instruments made in a wide variety of models differing considerably in size, appearance, and manner of operation, though generally their output must pass through external amplifiers and loudspeakers to produce sound.