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  2. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    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.

  3. Physician assistant - Wikipedia

    en.wikipedia.org/wiki/Physician_assistant

    A Physician Assistant or Physician Associate (PA) is a type of healthcare professional. While these job titles are used internationally, there is significant variation in training and scope of practice from country to country, and sometimes between smaller jurisdictions such as states or provinces. Depending on location, PAs practice semi ...

  4. Backline (stage) - Wikipedia

    en.wikipedia.org/wiki/Backline_(stage)

    Backline (stage) Canadian band Bedouin Soundclash performing. The backline gear, including an 8x10" bass speaker cabinet, drums, and several powerful guitar amps, can be seen behind the two musicians in the front of the stage. The term backline is used in popular music and sound reinforcement system contexts to refer to electronic audio ...

  5. Tannoy - Wikipedia

    en.wikipedia.org/wiki/Tannoy

    The company was founded by the Yorkshire-born engineer Guy Fountain (1898-1977) at a garage in Tulsemere Road, Dulwich in London as the Tulsemere Manufacturing Company. It originally made battery chargers for wireless radio sets. [2] The company name was changed to Tannoy in 1928 and a small factory was opened in Dalton Road, West Norwood ...

  6. Pascal (unit) - Wikipedia

    en.wikipedia.org/wiki/Pascal_(unit)

    10 Ba. The pascal (symbol: Pa) is the unit of pressure in the International System of Units (SI). It is also used to quantify internal pressure, stress, Young's modulus, and ultimate tensile strength. The unit, named after Blaise Pascal, is an SI coherent derived unit defined as one newton per square metre (N/m 2). [1]

  7. 1 Main Circuit - Wikipedia

    en.wikipedia.org/wiki/1_Main_Circuit

    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.

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