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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.
These sirens were used in the Oak Ridge, TN siren system, and are not known to be installed elsewhere. AL-1000/AL-2000 Electronic none none 1984-1995 Omni/uni Directional dB rating depends on model. A small industrial siren. These used smaller horns than the others. They had one 100 watt driver per horn (AL-1000) or two 100 watt drivers per ...
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 ...
Whelen Engineering produces sirens which oscillate through 360 degrees, rotating in one direction and then in the other to allow a hard-wired connection between the amplifiers and the siren drivers. [17] These sirens can also be set to rotate any amount from 0 to 360 degrees, allowing sirens to broadcast only in certain directions. [citation ...
In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.
Prototype EOWS 1212 - 1200 Watt omnidirectional siren, Several minor differences, Used 12 Atlas CJ44 speaker horns. EOWS* 408 – 800 Watt rotating siren with 4 circular University Sound DR-42 speaker horns. EOWS* 612 – 1200 Watt rotating siren with 6 circular University Sound DR-42 speaker horns. The 612 was the most produced model of the ...
This Q2B or "Q-siren" is mounted on a Pierce Platform Aerial Fire Truck owned by the City of Bellingham, WA. The Q2B siren ("Q-siren") [1] is an electromechanical siren that is produced by the Federal Signal Corporation and is most recognizable for its sound, which is trademarked, and the look of the siren.
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