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What a lot of people don't understand is speaker efficiency. So a 12 inch speaker that's 100db compared to one that's 95db is atleast 35% louder. Forget watts. That's just power handling.
A 12W amp with a 100db speaker would be just as loud as a 22w amp with a 95db speaker....
At home I play thru 6w champ clones running 2 x INCH. They are plenty for bedrooms. Just a little thin sounding I guess but still sweet.
People gig with 14W amps.
if you're referring to sound pressure levels in d(BA) for every 3 dB(A) you double the nosie level as the measurement is in logarithms
Although an increase of 3 dB represents a doubling of the sound pressure, an increase of about 10 dB is required before the sound subjectively appears to be twice as loud. The smallest change we can hear is about 3 dB. The subjective or perceived loudness of a sound is determined by several complex factors.
dB (decibel) ratings
Sound is defined as any pressure variation that can be heard by the human ear. This means an average range of frequencies from 20Hz to 20kHz.In terms of sound pressure level, audible sounds range from the threshold of hearing at 0 dB to the threshold of pain which can be over 130 dB.
www.e2s.com
Unless you are referring to sound power levels which is a whole different animal.