
Dictionary of Audio Terms (a glossary of audio terminology)
Efficiency

The ratio (expressed as a percentage) of the output energy in the required form to the total input energy. In a speaker, the ratio of power applied to input terminals expressed as a percentage. 
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Efficiency  The ratio (expressed as a percentage) of the output energy in the required form to the total input energy. In a speaker, the ratio of power applied to input terminals expressed as a percentage.
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