PA Systems Mixers Speakers Mic's

A “Public Address” system is anything that amplifies sound so more people can hear it. The most basic example might be a megaphone, or single microphone and speaker, used to make someone’s voice louder. These days most PA systems are used for music too. Prices vary widely, anywhere from several hundred dollars for a little karaoke set up to several thousand dollars for just one of Bruce Springsteen’s concert speakers. A few things that affect choices for a PA system include:
    •        The kind of music or speech being played
•     How loud it needs to play
•     The space where it’s being used
•     How portable it needs to be
•     Who is running the system                                                                                
•     Desired sound quality and durability
•     Cost

Most basic systems these days include several different parts such as:
    •        one or more microphones
•     one or more speakers
•     a “mixer” that allows the user to control the volume, tone and balance of different voices or instruments
•     an amplifier (built into the mixer, built into the speakers, or purchased separately)
•     stands to hold the speakers and microphones at appropriate height and angles

A public address system (PA system) is an electronic sound amplification and distribution system with a microphone, amplifier and loudspeakers, used to allow a person to address a large public, for example for announcements of movements at large and noisy air and rail terminals or at a sports stadium. The term is also used for systems which may additionally have a mixing console, and amplifiers and loudspeakers suitable for music as well as speech, used to reinforce a sound source, such as recorded music or a person giving a speech or distributing the sound throughout a venue or building.

Simple PA systems are often used in small venues such as school auditoriums, churches, and small bars. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings and locations. Intercom systems, installed in many buildings, have microphones in many rooms allowing the occupants to respond to announcements.