Keep in mind placement is critical with subs.
I have a SVS 20-39 and had to move it several times to get it sounding good. Corner loading is way too much for a SVS. I also had to turn it down several notches to keep my house from shaking apart. The other issue with subs is of course cross-over.

The Hsu is a very good sub and should do well for you if you set it up right. You can go to the Hsu Research website and Dr. Hsu will give you great advice on setting up your sub. You can also call him.

dsmith901