From what I see, there is no sub out jack on the base station. You'd have to purchase an Axiom wireless sub if you are not using a pre/pro and want to use an existing sub.

That's both good and bad. The bad is you're paying at least $Can 4K for a 2.1 system with the M5HP and EP500. The good, besides the awesome 'nad-mass of the integrated amps, is that you have a reason to upgrade a potentially crappy sub.