Power Amplifiers

At the most basic level, power amplifiers convert a weak input signal into a more powerful signal – with minimal distortion. On its own, a weak audio signal (from a mixing board, preamp, etc.) produces a modest electrical current. Power amplifiers, then, act as a middle man; they boost weak input signals to line levels that are compatible with speaker systems.

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An audio power amplifier (or power amp) is an electronic amplifier that reproduces low-power electronic audio signals such as the signal from radio receiver or electric guitar pickup at a level that is strong enough for driving (or powering) loudspeakers or headphones. This includes both amplifiers used in home audio systems and musical instrument amplifiers like guitar amplifiers. It is the final electronic stage in a typical audio playback chain before the signal is sent to the loudspeakers and speaker enclosures.

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