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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*This article is licensed under the Free Documentation License. It uses material from the Wikipedia article http://en.wikipedia.org/wiki/Amplifier