Public Address System

Public Address System

public address system (or PA system) is an electronic system comprising microphonesamplifiersloudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music. PA systems are used in any public venue that requires that an announcer, performer, etc. be sufficiently audible at a distance or over a large area. A PA system may include multiple microphones or other sound sources, a mixing console to combine and modify multiple sources, and multiple amplifiers and loudspeakers for louder volume or wider distribution.

Simple PA systems are often used in small venues. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings and locations—such as schoolsstadiums, and passenger vessels and aircraft. 

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