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Decibels are not quantities of anything, not even sound.They are the ratio between 2 different levels of power.Bels(in this case) are the relationship between amplitude and energy, decibels are 1/10th of a Bel.Bels are logarithmic, and its complicated even further by the fact human hearing is logarithmic as well.
3 dB = double the intensity
10 dB = ten times the intensity, but twice the perceived sound level
In terms of amps and speakers:
2X the amplified power = 3 dB
2X the speakers = 6 dB
2X the perceived loudness = 10 dB
Engines:
2X the horsepower = 3 dB
4X the engines = 6 dB
10x the horsepower = 10 dB
difference between 100 dB and 200 dB = 10x10x10x10x10x10x10x10x10x10 or 10 billion times the intensity=2x2x2x2x2x2x2x2x2x2 or 1024 times the perceived loudness
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-Nulli Secundus-
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