PA System
Public Address System (Definition )
A public address System (PA System) : is an electronic sound amplification and distribution system with a microphone. amplifier and loudspeakers. used to allow a person to address a large public. The term is also used for systems which may additionally have a mixing console. and amplifiers and loudspeakers suitable for music as well as speech, used to reinforce a sound source, such as recorded music or a person giving a speech or distributing the sound throughout a venue or building.