(1) In an audio system, the first amplifier to accept the signal from the transducer is generally called a preamplifier. Preamps must usually accept very low-level, e.g., mic-level, signals and amplify them to line-level without adding appreciable noise.

(2) A small amplifier built into a condenser microphone to boost the very low output level of the capsule before transmission over the mic cable.

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