en.wikipedia.org/wiki/Public_address_system

A public address system (PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the ...

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How to Choose an Effective PA System Whether or not we realize it, PA - or " public address" - systems are a ubiquitous part of everyday life. Retail stores, bars ...

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All-in-one portable PA systems for live performances, conferences, speech, gatherings, and parties.