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Once designed, the rigging points are hung from the structure, followed by chain motors (or blocks), flying frame and then the speakers. The individual boxes may be connected one at a time or rigged together on the ground and then pulled up. As the array is lifted, individual box angles are adjusted to match the array prediction program.
In 1974 Clair Brothers introduced their S4 all-in-one PA speaker. A radical departure from the different sized modular boxes generally used in large concert PA systems of the time. The S4 was a single box full range 4-way speaker weighing 425 lbs with integrated rigging hardware for suspending from the roof or superstructure of an auditorium or ...
Acoustic suspension or air suspension is a variation of the closed-box enclosure, using a box size that exploits the almost linear air spring resulting in a −3 dB low-frequency cut-off point of 30–40 Hz from a box of only one to two cubic feet or so. [16]
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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
Just two weeks ago, the Adams County, Pennsylvania, SPCA was near capacity as its kennels were filled with dogs needing homes. Now, for the first time in nearly 50 years, there are no dogs at the ...
In the 1960s, horn loaded theater and PA speakers were commonly columns of multiple drivers mounted in a vertical line within a tall enclosure. The 1970s to early 1980s was a period of innovation in loudspeaker design with many sound reinforcement companies designing their own speakers using commercially available drivers.
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