Hi JPM,
Any subwoofer, not just Axiom's, interacts with the specific dimensions of your room, its boundaries (the walls and floor) and the seating area and its location in your room. Those factors will determine how much bass you hear, and how smooth and deep the bass will be.
So you have to experiment with a sub's placement. Generally speaking (as others here have noted), it's really unwise to put any speaker, with or without ports, into an enclosure. Bass frequencies are largely omnidirectional, which means that they radiate in waves outwards from the speaker in every direction. Imagine throwing a stone into the center of a pond-- the waves radiate outwards in concentric circles from the point the stone hit the water--that's exactly how bass energy is dissipated from a subwoofer.
That's why you don't want to pre-determine a spot in your room for a sub, especially inside some type of enclosure.
Regards,
