Hi, I just got an onkyo 501 to go with my Axiom m2is and HSU STF-2. I think it sounds fantastic and has no problem getting to high volume in my modest room, bout 15x15. I have the crossover set to 80hz. My old receiver did not have the option for "small" speakers and sometimes I worried that the bass they were being sent might damage them. Now I don't have to worry about that. =)