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Ideally, I wish I could find a web-based calculator that will give the
change in loudness for increasing distanced from the source. One would
enter that the loudness is 140 dB (say) at the source, and enter than
one's ears are 50 yards away, and would get back the loudness at the
ear.

I don't need a high level of precision, just a ballpark figure.

Anybody know of such a thing, or have a spreadsheet that does the job,
or such like?