然后看看这段内容：
Question: How does the sound power decrease with distance"? Answer: "April fool -
The sound power does not decrease (drop) with distance from the sound source."
Levels of sound pressure and levels of sound intensity decrease equally with the
distance from the sound source. Sound power or sound power level has nothing
(!) to do with the distance from the sound source.
Thinking helps: A 100 watt light bulb has in 1 m and in 10 m distance really always
the same 100 watts, which is emitted from the lamp all the time.
Watts don't change with distance.
A frequent question: "Does the sound power depend on distance?" The clear
answer is: "No, not really."
We consider sound fields in air which are described by the scalar quantity sound
pressure p and the vector quantity sound velocity v as a sound field quantity.
摘自：http://www.sengpielaudio.com/calculator-distance.htm
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