Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by process]
7. [equipment for transmitting and reproducing sound]
8. audio equipment
9. microphones

Anotations

Scope note:

Microphones that have a diaphragm constructed of metal or metal-coated plastic film, stretched before an electrode. This diaphragm is depressed by sound waves causing a change in the distance between the diaphragm and electrode, causing a voltage change that is subsequently rendered as recorded, amplified, or broadcast sound. These microphones require a separate source of electrical current to operate, unlike dynamic or ribbon microphones.