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Preamplifier (Pre-amp)
A preamplifier (preamp), or control amplifier, is an electronic amplifier which prepares an electronic signal for further amplification or processing. In general, the function of a preamplifier is to amplify a low-level signal to line-level. A list of common low-level signal sources would include a pickup, microphone, turntable or other transducer. Equalization and tone control may also be applied.
Line level
Line level is a term used to denote the strength of an audio signal used to transmit analog sound between audio components such as CD and DVD players, TVs, audio amplifiers, and mixing consoles, and sometimes MP3 players. (Consumer electronic devices concerned with audio (for example Sound cards) often have a connector labeled "line in" and/or "line out". Line out provides an audio signal output and line in receives a signal input.)
출처 : http://en.wikipedia.org/wiki/Preamplifier
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