What is a speaker?
A loudspeaker (or “speaker”) is an electroacoustic transducer that produces sound in response to an electrical audio signal input.
Non-electrical loudspeakers were developed as accessories to telephone systems, but electronic amplification by vacuum tube made loudspeakers more generally useful.
The most common form of loudspeaker uses a paper cone supporting a voice coil electromagnet acting on a permanent magnet, but many other types exist.
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