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Inverse Square Law
This calculation will give you the amount of attenuation, in decibels, you can expect with a change in receiver distance, in a free field (outdoors).
For example if you were standing 20 feet from a
loudspeaker, and were to move to 40 feet away from that loudspeaker, you would expect to see a drop in level of
6 dB. Sound that is radiated from a point source drops in level at 6 dB per doubling of distance.
This form requires a Microsoft Internet
Explorer 4.0+ browser.
Thanks to Crown Audio for providing this useful online tool.
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