An audio power amplifier (or power amp) is an electronic amplifier that strengthens very low-power, inaudible electronic audio signals,
such as the signal from radio receiver or electric guitar
pickup to a level that is strong enough for driving (or powering) loudspeakers 
and being heard by listeners or the performer (with 
instrument amplifiers. Power amplifiers make the signal--whether it is recorded
music, a live speech,
singing, an electric guitar or the mixed audio of an entire band through a sound reinforcement system--audible
to listeners. It is the final electronic stage in a typical audio playback
chain before the signal is sent to the loudspeakers and speaker

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