Hi, I posted a question asking if this sub would sound good with Axioms or not just recently but I heard it on my friends system with some JM Labs speakers and it was great.
Its a David 302 by dbox (www.d-box.com); and they cost around 300$ exclusively(believe it or not) at Costco.

1xAxiom ax 1.2 2xPolk Audio R30 2xMordaunt-Short 3.0 H/K AVR 225 Paradigm PDR-10 Sub HTR MX-500