According to what I've read, doubling power = 3dB increase, and doubling speaker area = 3dB increase. But what happens if you have a SVT stack, then add another SVT stack. That should equate to a 6dB difference (2x power + 2x speaker are), but in my mind, it just seems to make more sense if you say it's twice as loud because you had 1 before, and now you have 2 (get it?). Can somebody clarify this for me? Thx.