Public address system

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A public address system (also known as Tannoy or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.

Excerpt from the Wikipedia article “Public address system”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: W.carter, CC0, via Wikimedia Commons.