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An audio amplifier is a device that reconstructs the input audio signal on the output component that generates sound. The volume and power level of the reconstructed signal must be ideal - true, effective and with low distortion. The audio range is approximately 20Hz to 20,000Hz. Therefore, the amplifier must have a good frequency response within this range (it should be smaller when driving speakers with limited frequency bands, such as subwoofers or tweeters).