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by seamusTX
Sun Apr 13, 2008 9:25 am
Forum: Off-Topic
Topic: Decibel level calculations
Replies: 5
Views: 831

Re: Decibel level calculations

That is correct. Sound pressure (that absolute measure of intensity of sound) decreases by the square of distance. So if you double the distance, you cut the sound pressure to 1/4 of its value. A reduction of 3/4 in sound pressure is equivalent to 6 dB.

So 77 dB at 300 yards will give you 71 dB at 600 yards.

That doesn't tell you how irritating or annoying the sound will be. Some frequencies and patterns of sound are more irritating than others.

- Jim

Return to “Decibel level calculations”