How loud is 138 dB? Very,
138 dB C-weighted
is approximately equal to 30,000 Watts of sound power. Wow!
Chrysler Air Raid Siren is the loudest sound signaling device ever
threshold of pain is 130 dB, anything above that level causes immediate
ear damage. The Chrysler Air Raid Siren produces that level
of sound nearly 200 feet in front of the projectors.
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The Chrysler Air Raid
Siren is approximately fourteen times louder than a jackhammer!
some perspective, the sound level on the deck of an aircraft carrier 50
feet from a military jet aircraft taking-off using an afterburner has
been measured at 130 dB. The Chrysler Air Raid Siren measures 138 dB at
100 feet (nearly twice the sound level at twice the distance).
popular air raid and
warning sirens today produce a sound level of 127 dB at 100 feet and
provide a typical one-mile radius coverage area. At 138 dB the Chrysler Air Raid
Siren is approximately two times as loud and will provide a
two and one-half mile radius coverage area with the same sound level at the
distant edge. The most powerful siren available for purchase today
(American Signal's Tempest™
produces a sound level of 135 dB at 100 feet.
The 3dB higher output of the Chrysler Air Raid Siren, at 138 dB,
represents twice as much sound energy output.
Siren coverage is based
on a 10 dB loss factor. That's to say, for every doubling of
distance from the siren the sound level will be reduced 10 dB. [
Coverage Standards ]
This is the loss chart
for the Chrysler Air Raid Siren:
Distance from Siren
Air Raid Siren
||Current Military Siren @ 100 ft
||Auto Horn @ 3 ft
||Close to Train
||Car at 65
MPH @ 25 ft
Raid Siren Effective Coverage Area ]