The 2039 replaced the Athena Sub 8, what a difference!
During my sub upgrade plan there were four subs I was interested in.
Axiom EP500, HSU VTF-3 Mk2, SVS 20-39PC Plus and Paradigm PW2200.
I didn't demo the EP500 or the PW2200.
The subs I did listen to are the:
Velodyne DPS 10B/12B
Athena AS-P4000
PSP sub5i
I know these subs don't come close to the SVS, that's why it went with it.
I wanted a 12"/~500watts/20Hz sub.
If cost is not a factor go with SVS, they are quite impressive