public-address system

Also known as: PA system, sound reinforcement system

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Last updated

June 17, 2026

Quick Summary

A public-address system, often shortened to PA system, is an electronic system that amplifies sound. It typically includes a microphone, an amplifier, and loudspeakers.12

This apparatus is used to broadcast sound, making it audible to a larger audience, such as in auditoriums or other public spaces. The term "PA system" is a common abbreviation for public-address system. These systems have been in use since at least 1917.12

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Olympic Games
Stockholm, Sweden, 1912
Electronic timing devices and a public address system were used for the first time. The Games were attended by approximately 2,400 athletes representing 28 countries. New competition included the modern pentathlon and swimming and diving events for women. The boxing competition was canceled by the Swedish organizers, who found the…
Read More
Electronic timing devices and a public address system were used for the first time. The Games were attended by approximately 2,400 athletes representing 28 countries. New competition included the modern pentathlon and swimming and diving events for women. The boxing competition was canceled by the Swedish organizers, who found the…
Read More