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The Real Issue with current outdoor Warning Systems: Frequency

Jun 23, 2010 3:25 pm

re: The Real Issue with current outdoor Warning Systems: Frequency

Richard Weisenberger

Here is something I believe more of you can relate to, since everyone has experienced it, but have you ever questioned it?

Have you ever noticed that when you hear a jet up close, the whine from the turbines can be deafening, while at a distance you hear only the roar? Even in nature, a nearby lightning strike cracks like a cannon, while at 2 miles away or more you hear mainly the rumble.

Speaking of cannons, they sound a lot different at 2 miles than at 1000 feet and I'm not just talking about the obvious reduction in sound level. The sound actually mellows from a sharp crack to a dull boom. This is what this discussion is all about. The higher frequencies may sound louder from up close but they don't have the carrying power of the lower frequencies.

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