A public address system is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.
Simple PA systems are often used in small venues such as school auditoriums, churches, and small bars.
A more complex PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings and locations—such as schools, stadiums, hotels, conference, health care facilities, house of worships and passenger vessels and aircraft. Often these systems involve acoustic studies and nose reduction and detection methods to get the clear sound to the occupants.
