Ribbon microphone

(left) RCA 44-BX ribbon microphone from 1940. (right) RCA Type 44 with the cover off. The magnet is visible at center, and the narrow aluminum ribbon is suspended between the triangular pole pieces (top).

A ribbon microphone is a type of microphone that uses a thin, electrically conductive ribbon (typically of aluminum, duraluminum or nanofilm) placed between the poles of a magnet to produce a voltage by electromagnetic induction. Ribbon microphones are typically bidirectional, meaning that they pick up sounds equally well from either side of the microphone but reject sounds from the sides.

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