The term PA System Components can refer to a variety of components that make up a public address system. One of these components is AMPS, which stands for Amplifier, Mixer, Power Supply, and Speaker. An amplifier is a device that increases the power of a signal, a mixer combines multiple signals into one, a power supply provides power to the system, and a speaker is used to project sound. All of these components are necessary for a PA system to function properly.