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The basic description is a device that serves as an input selector and router between the source and a power amplifier that can attenuate or amplify the overall volume level. A preamp is designed to get the signal from point A to point B with as little sonic deterioration as possible. Preamplifiers are designed to remove any unnecessary noise and interference from the source (turntable, CD player) to the speaker to deliver the truest sound that is available from the original source.