A public address system (PA system) is a sound amplification system used to allow a person or persons to address an audience at a greater volume than would be possible or practicable without such a system.
Some PA systems have speakers that cover an entire campus of a college or industrial site, or an entire outdoor complex (e. g. , an athletic stadium). A large PA system may also be used as an alert system during an emergency.
A more powerful and more complicated PA System is used to provide live sound reproduction. The "main" system and the "monitor" system on rental based
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