Din, the Axiom sub is regarded as good with the SVS and HSU subs a bit better (it's what they do). I have the 20-39PCi in a 16x22x10 room and it fills the room handsomely. The LFE is fabulous. I can't imagine neding more bass than the SVS provides. I like a bit extra and the gain is about 45% of max. Things rattle at that level. I don't think you make a mistake with this puppy.