A public address system (PA system)
It is an electronic sound amplification and distribution system with a microphone, amplifier and loudspeakers, used to allow a person to address a large public for example for announcements of movements at large and noisy air and rail terminals or at a sports stadium.
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.
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