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I've read this as well, 10dB equals a multiplication of 10 times (10*log(10) = 10dB).
Therefore, if they all had the same exhausts, it would take 10 Monsters to sound twice as loud as one Monster.
So 3bB being twice as loud isn't strictly true; it does take twice the power to produce a 3dB change but due to the ears response, it doesn't actually sound twice as loud.
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