• A circuit or device which provides and/or controls drive (1).
  • In an amplifier, the stage that precedes the output stage. Also called driver stage.
  • A transducer which converts electrical energy into sound energy, which is then radiated outward to the surrounding medium. Also called speaker, or loudspeaker.
  • Within a speaker system, a specialized speaker unit, such as a woofer or tweeter.

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