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  2. Whelen Engineering Company - Wikipedia

    en.wikipedia.org/wiki/Whelen_Engineering_Company

    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.

  3. List of sirens built by Alerting Communicators of America

    en.wikipedia.org/wiki/List_of_sirens_built_by...

    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 ...

  4. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    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]

  5. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    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 ...

  6. Federal Signal Modulator - Wikipedia

    en.wikipedia.org/wiki/Federal_Signal_Modulator

    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 ...

  7. Air horn - Wikipedia

    en.wikipedia.org/wiki/Air_horn

    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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