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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.
Owasso, Oklahoma had 16 ATI HPSS32 sirens that were installed more than 20 years ago. In December of 2023, all 16 HPSS32 sirens were replaced with Whelen WPS-2910 omnidirectional sirens, and a 17th Whelen was installed near Stone Canyon Elementary. Israel has 3100 sirens as a part of its warning system, and 300 of them are HPSS32 sirens.
The i-Force is an electronic siren made by ASC that comes in many different sizes (Sound Cells). Similar to Federal Signal's Modulator. E-Class Electronic none none 2002–Present Omni Directional dB rating depends on how many drivers. 400 watt speakers can be arranged in whichever pattern is needed. Very similar to ATI's HPSS omni-directional ...
However, sirens are designed to sweep the frequency of their sound output, typically, no less than one octave. This sweeping minimizes the effects of phase cancellation. The result is that the average sound output from a dual speaker siren system is 3 dB greater than a single speaker system.
Severn Estuary has a system of Modulator and DSA sirens. The system runs on both UltraVoice and MCP Controllers. They have very different tones compared to the American ones, potentially custom. The system is activated by radio signal at Avon and Somerset Police headquarters. Clemson University has a system of MOD-5020s, MOD-4016s and 2001s.
The combined siren loudspeakers receive emergency messages via satellite and have backup batteries if the power fails. [96] The Mill Valley Fire Department began testing its city's new LRAD installations on June 27, 2019. LRAD systems project both siren and voice recordings to alert and inform community members during large-scale disasters.
The purpose of warnings is to notify the population of a danger that threatens their lives. Individuals must go to shelters or their homes, lock doors and windows, take appropriate protective actions, and listen through the radio and television for instructions of civil defense. The entire siren system is ASC I-Force and Whelen WPS-2900 series.
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