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Message: <blockquote data-quote="Hriston" data-source="post: 6683159" data-attributes="member: 6787503">I'm not sure what you mean by fixed distances. The reason I'm using doubled distances is that every resource I've consulted says the sound pressure level is reduced 6dB for every doubling of the distance from the source of the sound. This takes the inverse-square law into account because we are using decibels, as you pointed out above, so I'm not understanding why you're suggesting fixed distances or what those distances would be.For clarity, my point wasn't that you could hear them clearly, but that under ideal conditions you could hear something, probably recognizing it as a voice, and know that someone was there.Here's an example of my work:Loud singing is measured at 75dB from 3' away from the source, so applying a 6dB drop per doubling of that distance you'd end up with a sound pressure level of 33dB at 384', and 27dB at 768', both of which are close to the sound level of a whisper measured from 6' away (30dB).For ambient noise I'd use disadvantage on perception.</blockquote>