>>Did that mean most people think it sounds better than the Axiom or that sound quality doesn't differ but the Hsu can be had for cheaper?
I haven't heard the Axiom so just going on reviews here. The general consensus seems to be that the Hsu goes deeper *and* holds up better at high volumes than the Axiom, but the Axiom may be better for a pure music application by virtue of having front-firing driver and ports. I don't know the mechanics of it but there seems to be a general view that down-firing subs are not quite as "quick and responsive" for musical applications.
I was ready to get an STF-2 but the dealer I spoke with suggested that I would be happier with the PSB if I was primarily listening to music. They sold a lot of Hsu subs for HT (great LFE *and* great value) but still leaned towards the PSBs for music.
I imagine the Axiom subs are similar to the PSBs in that regard. Don't know if this helps