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  2. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    Some PA systems have speakers that cover more than one building, extending to an entire campus of a college, office or industrial site, or an entire outdoor complex (e.g., an athletic stadium). A large PA system may also be used as an alert system during an emergency. PA systems by size and subwoofer approach

  3. Tannoy - Wikipedia

    en.wikipedia.org/wiki/Tannoy

    Actor Cyril Ritchard and three young women listen to the Tannoy public address system in 1948. Professional studio monitor Little Gold Monitor (c. 1990) with two-way-coaxial construction, meaning the tweeter for frequencies from 1.400 Hz and above is located independently in the center of the 30 cm bass driver.

  4. PA system - Wikipedia

    en.wikipedia.org/?title=PA_system&redirect=no

    This page was last edited on 31 May 2013, at 10:18 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply ...

  5. Live PA - Wikipedia

    en.wikipedia.org/wiki/Live_PA

    Live PA (meaning live public address, or live personal appearance) is the act of performing live electronic music in settings typically associated with DJing, such as nightclubs, raves, and more recently dance music festivals.

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  7. Corsi–Rosenthal Box - Wikipedia

    en.wikipedia.org/wiki/Corsi–Rosenthal_Box

    An example of a homemade unit. The Corsi–Rosenthal Box is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It consists of four [1] or five [2] [3] HVAC particulate air filters that form a cube and a box fan to draw air through the filters.