Here are photos and a news section on the Indian Point Nuclear Power Plant's replacement of old sirens within a 10 mile radius of the plant. All old sirens replaced with ATIs (very sad ):
http://www.safesecurevital.org/sirens/photos.html
That certainly does sound different from the ATIs in Nashville! It's a lower pitch and more intense sound.If you click the main subject head SIRENS you can hear a clip of the new sirens, It does not sound like the typical Beeper. Maybe ATI has changed the sound of the speaker array?
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