![]() ![]() Real world sources actually do behave like point sources, provided you are far enough away. Point source refers to an ideal sound source that sends sound out equally in all directions. ![]() The math above applies to a point source in free field conditions. Dividing the distance by a factor of twenty adds 26 dB to the sound level. That means that the distance is “two times ten times away.” Doubling distance subtracts 6 dB from the level multiplying distance by ten subtracts 20 dB. For instance, the distance ratio is 20:1.
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