I have not had the pleasure of hearing *any* of Axiom's subs. So direct comparisons will have to be made by others.

I can say that I'm very happy with my SVS PCi+ 20-39. IMHO, it's a great sub. Wonderful, ample, & clean bass. Enough to break my house. ;\)

M80v2 | VP150v2 | QS8v2
SVS Pci+ 20-39
Emotiva UMC-1 & LPA-1
M22ti + T-Amp, in the Office