Public Address system is used for sound amplification of voice or music over a large area. Public Address system are usually used in shopping malls, Hospitals, airports, factories, schools and any other premises that requires to broadcast an announcement or message for a large number of people in a large area. Public Address system usually consist of Microphones, for the announcer to speak into to convert voice into electrical pulses, Amplifier to magnify the announcer’s voice, and speakers to convert the electrical pulses to sound. Public Address system may be also including automatic voice messages for different emergency announcements, like fire or gas leaks etc.