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An example product from the Mass Notification Products Division is the Whelen Hornet, which is an electronic civil defense siren introduced in 1995. It contains a single 400-watt speaker. The siren's appearance is best described as a small dish on a square rotator platform, with the single driver located at the center of the horn.
Electronic none none 1991–1994 Rotating 126 dB at 100 feet This was the replacement for the AL-6000R. It only has 4 horns rather than 8. These came with 16 100 watt drivers, 4 on each horn. Quadren Electronic none none 1992–1994 Omni/uni Directional dB rating depends on model. One of the last electronic sirens made by ACA before their ...
Electronic Sirens Pavian by Telegrafia A Whelen WPS electronic siren imported to Saudi Arabia by HSS Engineering for use as a civil defense siren. There are 8,200 alarm sirens for civil protection throughout Switzerland. They are tested once a year, on the first Wednesday in February. [1] Sound sample ⓘ An 1860s-era siren. [2]
Other tones include Westminster Chimes (commonly used for the testing of electronic sirens), hi-lo (high-low), whoop, pulse (pulsing), air horn, and fast wail. The U.S. federal standard regarding emergency warning signals is defined in FEMA's Outdoor Warning Systems Guide, CPG 1–17, [ 97 ] published on March 1, 1980, which describes the Civil ...
The Modulator has a similar setup to the Whelen WPS 2700, 2800, 2900, and OmniAlert omnidirectional speaker arrays. The Whelen arrays have single driver cells, [3] while Modulators have multi-driver cells. The American Signal I-Force siren, which uses stacked, elliptical speaker cells that provide omnidirectional sound output, is also similar ...
An air horn consists of a flaring metal or plastic horn or trumpet (called the "bell") attached to a small air chamber containing a metal reed or diaphragm in the throat of the horn. Compressed air flows from an inlet line through a narrow opening past the reed or diaphragm, causing it to vibrate, which creates sound waves .
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