Amplifiers or amps are devices used to strengthen voltages or power of signals. There are two major types of amplifiers, weak signal amplifiers or power amplifiers. Power amplifiers are usually used in sound reinforcement systems to amplify audio signals to a high-quality sound. Amplifiers are connected to speakers which become the final source for producing sound. Public address systems altogether are used in areas like stadiums, railway stations, metro stations, schools, prayer halls, industrial premises, and other similar places to make important announcements or for emergency communication. Public address speakers or amplifiers also are of high importance in the field of defense which are used for communication to people or fellow officers during emergency call outs.
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