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INVERSE SQUARE LAW CALCULATOR - COPYRIGHT CROWN®
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. Make sure to press the "Reset" button before performing each calculation. This tool is useful when designing audio systems with various listener seating locations and values. This Javascript calculator requires Microsoft Internet Explorer v4.0+ or Mozilla Firefox v1+ browser.
EQUATION USED TO CALCULATE THE DATA:
Snew=Sref + (20 * Log (Dref / Dnew)
WHERE:
Dref = Reference Distance
Dnew = New Distance
Sref = Reference Sound Level
Snew = New Sound Level
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