The [b]public address system[/b], also known as the [b]PA system[/b], is an electronic system that uses microphones, amplifiers and loudspeakers to broadcast messages or music over large areas to many people. Also known as a [b]sound reinforcement system[/b], particularly when used for live music, speeches, or lectures.

h4. External links
* "Wikipedia: Public address system":[https://en.wikipedia.org/wiki/Public_address_system]
public address system