Text: Preamplifier is a section of the amplifier, sometimes called "preamp" for short, that contains the various controls to regulate volume, balance, treble, bass, and to select different program sources (records, radio, or tape). In most models, the preamplifier and the main amplifier (also called the power amplifier) are a single unit. However, in equipment designed for very high output power, the preamplifier and the power amplifier are separate pieces of equipment.

See Also:

Source: 103