Small_systems Public_address_system

public address system in school

the simplest, smallest pa systems consist of microphone, amplifier, , 1 or more loudspeakers. pa systems of type, providing 50 200 watts of power, used in small venues such school auditoriums, churches, , coffeehouse stages. small pa systems may extend entire building, such restaurant, store, elementary school or office building. sound source such compact disc player or radio may connected pa system music can played through system. smaller, battery-powered 12 volt systems may installed in vehicles such tour buses or school buses, tour guide and/or driver can speak passengers. portable systems may battery powered and/or powered plugging system electric wall socket. these may used people addressing smaller groups such information sessions or team meetings. battery-powered systems can used guides speaking clients on walking tours.

public address systems consist of input sources (microphones, sound playback drvicrs, etc), amplifiers, control , monitoring equipment (e.g., led indicator lights, vu meters, headphones), , loudspeakers. usual input include microphones speech or singing, direct inputs musical instruments, , recorded sound playback device. in non-performance applications, there may system operators or automated equipment uses select number of standard prerecorded messages. these input sources feed preamplifiers , signal routers direct audio signal selected zones of facility (e.g., 1 section of school). preamplified signals pass amplifiers. depending on local practices, these amplifiers amplify audio signals 50v, 70v, or 100v speaker line level. control equipment monitors amplifiers , speaker lines faults before reaches loudspeakers. control equipment used separate zones in pa system. loudspeaker converts electrical signals sound.