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A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.
1 Main Circuit (1MC) is the term for the shipboard public address circuits on United States Navy and United States Coast Guard vessels.This provides a means of transmitting general information and orders to all internal ship spaces and topside areas, and is loud enough that all embarked personnel are (normally) able to hear it.
Varizone is a fully digital public address system technology developed and produced and by Klotz Digital.. In contrast to traditional public address systems using analogue 70 or 100 volt speaker systems Varizone is a fully digital system that transmits the audio digitally to the speaker, where it is amplified by small, distributed programmable amplifier modules.
The public address systems under the name of Magnavox were used all over the United States. It was used by U.S. President Woodrow Wilson in 1919. World-wide there were no other companies manufacturing public address systems until 1920. He designed the Magnavox dynamic loudspeaker for reception of radio broadcasting in 1919.
TOA Corporation (TOA株式会社, Tī Ō Ē Kabushiki-gaisha) is a Japanese electronics company, specializing in public address systems, intercom systems, microphones, array speakers and megaphones. [3]
A butler uses an intercom on behalf of a lady. An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [1]
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