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voice coil

noun Electricity.
  1. a moving coil that drives the diaphragm of a sound reproduction system, as a loudspeaker, by the interaction of a changing magnetic field that is produced by a current in the coil and a fixed magnetic field that is produced by permanent magnets.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018