Axiom Home Page Forums General Discussion Stereo ok. HSU VTF 3 MK2.....

Here is a link explaing why a subwoofer sounds musical.
Subwoofer designs and how it impacts characteristics

Here are comparison threads with the HSU:
HSU VTF-3 compared to Rocket UFW-12
HSU VTF-3 compared to ACI Maestro

But as Jack said, I don't think you can go wrong with the VTF-3, especially if you are going to use if for HT later.