What Is a Power Amplifier?
Power amplifiersA power amplifier increases the strength of an audio signal so that it has enough power to drive a pair of loudspeakers.
Power amplifiers
A power amplifier takes a low-level audio signal from a preamplifier and increases its power so it can drive loudspeakers. Unlike an integrated amplifier, it usually has no volume or source controls, focusing solely on providing clean, powerful amplification.