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How does loudness fall with distance from speaker?

Say you were picking a speaker for a club or auditorium The speaker is rated at 90dbw meaning an input of one watt will produce 90db at a distance of one meter. What will be the likely decibel level at ten or twenty meters? I was thinking that for an omnidirectional radiator in free space the sound intensity would fall in inverse proportion to the radius cubed but not sure how to convert that to decibels. In a real-world space you have walls, floor and ceiling and reverberation and absorbent bodies and so on. Is there a rule of thumb?
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Topic - How does loudness fall with distance from speaker? - ph5y 06:52:25 06/10/16 (15)
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