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PA System
A public address or "PA" system is an electronic amplification
system with a and , used to reinforce a given sound, e.g., a person making a
speech, prerecorded music, or message, and distributing the sound throughout a
venue.Simple PA systems are often used in small venues such as school
auditoriums, churches, and small bars. PA systems with a larger number of
speakers are widely used in institutional and commercial buildings, to read
announcements or declare states of emergency. Intercom systems, which are often
used in schools, also have microphones in each room so that the occupants can
reply to the central office.
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