Right, all of which is acoustic power, which is different than what it actually sounds like to your ears. The audible scale is logarithmic as well, but the doubling interval is 10 db.

Is the db used for audible hearing the same unit of measurement used for acoustic power? If so, then I maintain that it is an incredible coincidnce that an exact doubling of two unrelated attributes is acheived at intervals of roughly round numbers. That is, unless either the attributes or the unit of measurement has been rigged to produce this result.

It's only cool insomuch as they're both logarithmic scales and logs can do some pretty funky stuff in math. They don't actually keep pace with each other or anything when you look at them. As for whether the even numbers are a coincidence, I'm pretty sure the unit was designed with the 10 db = doubled hearing level calculation in mind. I think the 3 dB being so close to a round number is the coincidence.

*nerdgasm*