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2. 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 ...

3. Whelen Engineering Company - Wikipedia

   en.wikipedia.org/wiki/Whelen_Engineering_Company

   The Whelen Engineering Company is an American corporation that designs and manufactures audio and visual warning equipment for automotive, aviation, and mass notification industries worldwide. Founded in a Deep River, Connecticut garage in 1952, [ 1 ] Whelen has become a provider of warning lights, white illumination lighting, sirens, and ...

4. Siren (alarm) - Wikipedia

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

   In Germany and some other European countries, the pneumatic two-tone (hi-lo) siren consists of two sets of air horns, one high pitched and the other low pitched. An air compressor blows the air into one set of horns, and then it automatically switches to the other set. As this back and forth switching occurs, the sound changes tones.

5. Civil defense siren - Wikipedia

   en.wikipedia.org/wiki/Civil_defense_siren

   Federal Signal Model 5 in Ballston Spa, New York, U.S.. Sirens are sometimes integrated into a warning system that links sirens with other warning media, such as the radio and TV Emergency Alert System, NOAA Weather Radio, telephone alerting systems, Reverse 911, Cable Override, and wireless alerting systems in the United States and the National Public Alerting System, Alert Ready, in Canada.

6. 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 .

7. Towns relishes an enjoyable return to Minnesota, from the ...

   www.aol.com/towns-returns-minnesota-trying...

   New York Knicks center Karl-Anthony Towns acknowledges the crowd before an NBA basketball game against the Minnesota Timberwolves, Thursday, Dec. 19, 2024, in Minneapolis.

8. From Side Hustles to Spreadsheets: 9 Money Trends To Watch in ...

   www.aol.com/side-hustles-spreadsheets-9-money...

   It's a new year, which means anything can happen, including with people's finances. Consider This: I'm a Financial Advisor: 10 Most Awesome Things You Can Do for Your Finances in 2025 Find Out: Why...

9. ‘The Rye Horn’ Review: Womanhood Is a Trial in an Earthy ...

   www.aol.com/rye-horn-review-womanhood-trial...

   Rather than horns, they look like tiny black catkins clinging to the grains on swaying stalks of rye. These little clusters — actually a fungus known as ergot — are a disease that affects the ...