PA System



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What Is PA System ?

A public address system (PA system) is an electronic amplification system with a mixer, amplifier and loudspeakers, used to reinforce a sound source, Simple PA systems are often used in small venues such as school auditoriums, churches, and small bars. PA systems are used in any public venue that requires that an announcer, performer, etc. be sufficiently audible at a distance or over a large area. Typical applications include sports stadiums, public transportation vehicles and facilities, and live or recorded music venues and events. A PA system may include multiple microphones or other sound sources, a mixing console to combine and modify multiple sources, and multiple amplifiers and loudspeakers for louder volume or wider distribution.

Dedicated to Saving LivesThe main parts of a PA system

A microphone is a device for converting audible sound into a signal. To accomplish this task with the optimum efficiency and quality of result requires a type of mic that is appropriate to the particular situation.

A mixer is equipped with a number of channels (usually a multiple of 4), each of which provides control over a single signal source such as a microphone or an instrument.



The amplifier is usually side by side or incorporated with the mixer. The amplifier's job is to magnify the audio signal by manipulating its varying frequency qualities.



The loudspeaker is the output end of the PA system, transforming the electrical signal back into sound that a group can hear.




Working Of PA System

The goal of a PA system is to provide "public address", or a way to transmit audio communication to a group. This transmission can begin with a microphone, which is a device that can assist in magnifying an audio source's volume. A microphone is classified as a device that transforms sound into an electrical signal. Microphones used in PA systems are usually dynamic or condensers. Dynamic microphones are more rugged than condensers and are able to withstand the elements a little better. Condenser microphones utilize their own power source and produce better-quality audio signals, but can sometimes be so sensitive that they also receive background noises.

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