The max power output of an amp (especially in the realm of multichannel home theater setups) is somewhat theoretical - driving all seven channels (or even one or two channels) to a level near that rated max is very difficult. Those 5 monoblocks (or five channels of the 770) could output 1000W (and probably consume 1500W from the wall), but short of some sort of speaker torturing, ear drum shattering, earquake simulating test tone you would not actually reach those power demands. You could simply use the 15A circuit in the living room for the entire system and never have a problem - I actually ran my system at my old house on a 15A circuit shared by kitchen, living room, and bathroom (with a Model 750 amp, Parasound two channel amp bridged to mono, subwoofer, 27" TV, and source components). Plus I would personally prefer not to have a heavy cord like that running exposed that far in my home - just feels a little iffy to me.