I've got my system running off a dedicated 20 amp circuit ( 12ga wire ). I have multiple outlets around the room all running off the same circuit so I can install my sub almost anywhere and it's ground will be as close as possible to everything else ( trying to avoid any ground loop problems ). I've got another set of circuits in the room for regular use such as lights and lava lamp. I don't want anybody to plug in a space heater on the same circuit as my system.

My entire system (minus the sub) is fed from a Panamax 5100 line conditioner. So, all the systems power is flowing through one standard 15 amp, straight blade plug. Yes, even though it's a 20 amp circuit it all still goes through a 15 amp bottleneck at the end. The voltage does drop for a fraction of a second when I power up the TV or the 770 amp, but the lights in the house don't dim. That's normal, and that's why most systems and line conditioners have power on delays to spread out the startup surges of all those gizmos.