A loudspeaker which rotates, or more commonly, a (stationary) loudspeaker inside an enclosure which rotates. Typically, the enclosure consists of a cylinder, with a hole cut at some rotational position, and closed at the top and bottom. It may also use a rotating horn. The loudspeaker itself fires into the cylinder from the top or bottom, and sound emerges from the rotating hole. A motor rotates the enclosure at a fairly slow speed, ranging from 10-150 revolutions per minutes typically. Usually, this will all be encased within a stationary cabinet.
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