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  1. A transducer which transforms acoustical energy into mechanical energy, and then electrical energy. A device that changes sounds into tiny voltages that can then be amplified, modified, recorded, etc. Source: Church Audio & Acoustics Glossary
  2. An acoustical-electrical transducer by which sound waves in air may be converted to electrical signals. Source: http://www.owenscorning.com/around/sound/glossary.asp

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