- noun the ability to act or produce something with a minimum of waste, expense or unnecessary effort
- The ratio of the useful power or energy output of a device or system, to its total power or energy input. Also called output efficiency (2), or power efficiency (1).
- The proportion of the audio frequency electrical power input to a speaker which is converted into acoustic energy. Efficiency may be measured, for instance, by driving a speaker with a power input of 1 watt, and measuring its output, in decibels, at a distance of 1 meter. Also called speaker efficiency, loudspeaker efficiency, sensitivity (4), or power efficiency (2).
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