PA SYSTEM
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A public address system (PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. Intercom systems, installed in many buildings, have both speakers throughout a building, and microphones in many rooms so occupants can respond to announcements.
Music can be played through a PA system by feeding the sound through one or more channels on the mixer. A public address system's most basic function is to amplify a single microphone through a powered speaker. The amplifier receives the signal from the microphone, amplifies it according to the level control on the speaker, and then sends sound to the speaker.