Hello, in all honesty, yes, you should be fine- you will not need a dedicated circut to run that amplifier provided the room was wired correctly. The typical 15 amp circut is more then enough. But I must ask, have you discovered the source of the buzz? I would find what EXACTLY was causing this first.
And BTW, that Outlaw amp is built to order by ATI. Very good amplifier.
ATi 1805/Odyssey Stratos-NAD T785 as the control center, 65" Pany Plasma, Panasonic BR, Tosh HD, JVC SVHS, Thorens TD-318w/ Shure Ultra 400s, Jolida Ref. CD player, AQ cable's. JBLTi/L series Mains and surround (2 centers), 2 MK MX-250 for front subs, MK 1250Thx rear, - APC power protection and stabilizer.