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Originally Posted by Fat Jack
Do you disagree that 88 dB is four times louder than 82 dB?
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I disagree. 88 dB is 6 dB louder than 82 dB, that's it. I agree that the power density of the sound is 4 times higher at +6 dB, but humans don't hear power density in a linear fashion, hence the need for dB to relate sound levels in the first place.
To a human, 102 dB is four times louder than 82 dB. It generally takes a 10 dB increase for a human to perceive something as "twice as loud".
That said, I'm all for quiet boats. Quieter the better. Same with motorcycles, cars, non-military airplanes, and neighbors; especially neighbors with a penchant for karaoke parties.