A PA system, also known as a public address system, is a set of equipment used to amplify sound to a large audience in a public space or venue. The system typically includes a microphone or other input device to capture sound, an amplifier to boost the signal, and one or more speakers to broadcast the sound to the audience.
PA systems are commonly used in settings such as concerts, sporting events, rallies, and public meetings. They can also be found in schools, churches, and other institutions where announcements or presentations need to be made to a large group of people.
Modern PA systems may also include additional features such as digital signal processing, wireless connectivity, and remote control capabilities. Some systems may be portable, allowing them to be easily transported and set up in different locations as needed.