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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.
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