PREAMPLIFIER: Audio component that adjusts the volume of an low-level audio signal and performs switching functions between attached input devices (DVD player, Cable box, etc.) and an amplifier or group of amplifiers. (A preamplifier is also called a processor, or a Pre-Pro {from PREamplifier, and PROcessor})
AMPLIFIER: Electronic component that accepts a low-level signal and recreates the signal with more power; this term is most often used in audio/video to describe an audio component which takes in line-level audio signals through interconnect cables and outputs a high-powered replica of the input in order to drive speakers and create sound.
INTEGRATED AMPLIFIER: Audio component combining the elements of an amplifier with those of a preamplifier, but not containing a tuner. (Making an integrated amplifier different from a receiver which does contain a tuner.)
TUNER: Tuners are primarily used for FM and AM radio reception.
RECEIVER: Combination, in one component, of an amplifier, preamplifier, and tuner.
