Rel t9x or Rythmik F12G

I haven't heard the T9x, but had Rel Storm III and replaced it with two F12. Way better and cheaper. Eventually (about 6 years later) went with four F12. This gave a way more even response, plus more body.

I would go with one F12 and see if later you want add another. 2 is generally better than 1, 3 better than 2, 4 better than 3 (Unless you have total freedom in layout - then 3 is probably enough).

Rhythmik all the way.  I ran them with Magnepans and it was amazing.  You have to spend a lot more money on the REL to best the Rhythmik.

@noromance OP is using Klipsch Fortes in a small room. He's already overpowering the room. Be that as it may, and much as I love the REL T/series, they're simply not a good match for the Klipsch. IMHO in an 11X11 room first he needs acoustic treatment and bass traps, then rethink the entire speaker setup. With something more to room scale for both the mains and subs. JBL 4309 and REL T/9x comes to mind.

The Svs sb-3000# are very well built and have tight bass and a great app to control 

and $100off on a pair. Free shipping 5 year warranty and I think a 45 day review period.

Amazing how someone can state "already overpowering the room" without any evidence.  I'm currently using a REL S510, located in my room's primary bass node, which is located right next to my seating position.  Completely invisible with my Forte IVs.  Considering adding two T5's. When properly set up, RELs can be a great addition, without "overpowering the room.?