Don't own an Axiom sub, don't know their sound quality. The highly acclaimed Hsu, don't own one either, is the bench mark (by critics' opinion anyway)for Axiom to beat.

Here is a link to the evaluation of the new Hsu sub.

http://www.avsforum.com/avs-vb/showthread.php?s=ed8d5d898250c7ef037b7d3daa4a0db4&threadid=135098