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Sound Power Levels

Sound powers for the following equation in dBA units are referenced to a picowatt (10-12 W).

Sound Power Formula - RF Cafe


Where: W1, W2 = sound power in similar units of watts

The threshold of pain for the human ear is usually taken to be around 120 dBA.



The following table presents examples of some common noise sources.


Situation
and
sound source
sound power
Pac
watts
sound power
level Lw
dB re 10−12 W
Rocket engine1,000,000 W180 dB
Turbojet engine10,000 W160 dB
Siren1,000 W150 dB
Heavy truck engine or
loudspeaker rock concert
100 W140 dB
Machine gun10 W130 dB
Jackhammer1 W120 dB
Excavator, trumpet0.3 W115 dB
Chain saw0.1 W110 dB
Helicopter0.01 W100 dB
Loud speech, vivid children0.001 W90 dB
Usual talking, Typewriter10−5 W70 dB
Refrigerator10−7 W50 dB
(Auditory threshold at 2.8 m)10-10 W20 dB
(Auditory threshold at 28 cm)10-12 W0 dB

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