I did a search on the forums and didn't see to many topics on this but I was wondering which of the two subs are better?

Axiom EP500 vs SVS-PB12

Has anyone heard both of these subs? Is there much of a difference between the two?

Here is the review for the SVS-PB12
http://www.audioholics.com/productreviews/loudspeakers/SVSPB12Plus2p1.php