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, LG BR, Tosh HD, Integra RDC-7& RDA-7, Thorens TD-318, Shure Ultra 400s, AQ cable's. 2 JBL 2241 18" subs/ JBLTi/L series Mains and surround (2 centers), 2 MK MX-250's, MK 1250Thx rear For HT, 60" Pany Plasma- APC power protection and stablizer. 110" projetion soon.