Submitted RelativeMischief, Feb 23 2004 11:57 PM | Last updated Feb 23 2004 11:57 PM
A pre-amp is the first device in a gain structure. It is used to bring a relatively weak microphone signal up to line level. It is often found at the top of a mixing console or as a dedicated outboard device. In the mixing console, the amount of signal gain is determined by a "gain" or "trim" knob.