Have you played with the online
SPL calculator yet?
And just so you know... I have 5 Outlaw 2200s plugged into one household outlet. No special cuicuitry, no dedicated breaker...
I also have two X13 subs on the same line, the TV, AVR, my computer, etc on that same circuit. I have yet to pop anything. *knocks on wood
Remember, it takes 1w to make your speaker produce 90dB at 1m. Even if I listen to all 7 channels at once, plus my subs... I'm probably rarely pulling more than 10-15 watts. (My normal listening level though is about -10- -15 dB in 2.2 stereo.... so less than 2w for the speakers plus whatever the subs are using.)