An audio power amplifier is a device that amplifies low-power electronic audio signals, such as the output of a radio receiver or an electric guitar pickup, to a level strong enough to drive loudspeakers or headphones. It forms the final electronic stage in an audio playback chain, used in home audio systems, concert sound reinforcement, public address systems and musical instrument amplifiers such as guitar amps, boosting signals that may measure only a few hundred microwatts up to a few watts in consumer devices or tens of thousands of watts in large concert systems; many consumer electronics combine a preamplifier and a power amplifier in a single unit, though standalone power amplifiers remain popular with audiophiles and professionals.
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1. Wikipedia, Audio power amplifier
Lead sectionQuote, Lead section
An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.
Wikidata: Audio power amplifier
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