found this online today:
NYPD Testing New Sirens
MyFoxNY.com -- The NYPD is testing a siren that emits a deep bass boom that you can feel as well as hear. Police say it's designed to get the attention of drivers who might be distracted by loud music or air conditioning and even pedestrians who are wearing headphones.
http://www.myfoxny.com/myfox/pages/H...Y&pageId=1.1.1
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