There are a lot of subs on the market Cam, lots with great output ability. I've never heard anyone on other forums having this issue, many people daisy chain subs. Maybe it is just the Axiom design, not sure.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85