Hello,
I just searched the WWW looking for information on horn distortion and came across this thread. I am surprised with the misunderstanding of dB’s.
Even if this is from years ago here goes.
dB=20*Log10()
If the power input to the speaker is X 1:
dB=20*Log10(1) = 0dB change
If the power input to the speaker X 2:
dB=20*Log10(2) = 6.02dB change
If the power input to the speaker is X 4:
dB=20*Log10(4) = 12.04dB change
If the power input to the speaker is X 8:
dB=20*Log10(8) = 18.06dB change
If the power input to the speaker is X 16:
dB=20*Log10(16) = 24.08dB change
For each doubling of the power input there is a 6dB increase in the output. I do not remember where this 3dB delta misconception came from.