Milestone Systems

Apublic address system(PA system) is an electronic system comprisingmicrophones,amplifiers,loudspeakers, and related equipment. It increases the apparentvolume(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. Typical applications include sports stadiums, public transportation vehicles and facilities, and live orrecorded musicvenues and events. A PA system may include multiple microphones or other sound sources, amixing consoleto 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 such as school auditoriums, churches, and small bars. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings and locations—such asschools,stadiums, and passenger vessels and aircraft.Intercomsystems, installed in many buildings, have both speakers throughout a building, and microphones in many rooms so occupants can respond to announcements. PA and Intercom systems are commonly used as part of anemergency communication system.