Dan, I've been hesitant with building the sub in - just for the reasons you mentioned. I was hoping a front firing sub might help. Right now I have a down firing HSU something or other (in storage) which I could place somewhere else but it is not ideal since it is the typical big black box.

What are the chances Axiom comes out with an in-cabinent subwoofer in the next 6 months...?

Temp.setup - 2.1 - Denon 1713 AVR, Denon 1713 BRD, Paradigm Cinema 200, and Monitor Audio 360 Sub