I have had 5 different SVS subs, none of which are still here. I had one of very expensive Paradigm subs which was too boomy for me, so it's gone. The room I am in is 30x30 with an 18 foot high vaulted ceiling, a mezzanine level overhead walk way, stone under it and glass on the opposite wall. The other walls are made up of cabinets, stereo gear, book shelves.... its a mix of everything, but for some reason, things just work well for 2 channel stereo which is my main use. I am currently using three subs: Axiom Audio EP800, EP500 and a Bryston Model T sub. The Bryston is made for them by Axiom too. Honestly, there is no comparison between the Axiom products and any of the SVS subs I used including their flagship Ultra SB16. Hands down the Axioms are far more powerful, smooth and just plain musical. For your sized sub required, I'd suggest the EP500. And pay no attention to the power ratings on subs. The SVS's were rated at some huge number of watts, but after two of them burned out and I took them apart to inspect; all I can say is the amps are in my opinion too light. The Axiom amps which are rated at a much more conservative output have monster linear toroid power supplies.... the dynamic head room is immense and you cannot clip these drivers.
Check them out, I think you will be very happy.
Check them out, I think you will be very happy.