Wikipedia (Beta): Audio amplifier

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An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 hertz to 20,000 hertz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.
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    The amplification chain
    An electric signal that is generated by an acoustic source, such as a signal issuing from a microphone, must be correctly amplified before it reaches the diffusers.

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