Originally Posted by sc00by4life
its actually a little less than that. a doubling of source = 3db increase.
10 * log10 (2) = 3.01 dB, where 2 is the double in power (volume).
agreed on the distance though, as that perceived volume will change.
Actually no. Doubling POWER is 3dB. Doubling amplitude is 6dB. NEITHER relates to a doubling of perceived volume, that is a much more complex calculation as you have to deal with weighting. Two signals of equal amplitude perfectly constructively interfering should equal twice the amplitude.