Let me throw a monkey wrench in here and suggest you get a pair of Seaton JS
-12s. (I know, I know, I'm not recommending a Rythmik, stay calm.) Yes, they're sealed but they punch way
above their weight, and being sealed they roll off more gradually, so they sound like they go lower than the rated 20Hz. They have excellent WAF (small) with multiple finishes available. With your bigger space you really want 2 subs, and you can go amazingly far with two pretty small boxes here.
Most importantly, they sound great. When we did the meet here in Houston and they hooked up a pair of these, I was stunned at how well they filled the big space and how clean the sound was. The big JTR was ultimately louder but I didn't think it was any better sounding—that went to (of course) the Rythmik FV18.
I love my L22 but if I were going to do it all over I'd probably have bought a JS
-12 and then added a second one later. I probably can't finagle a second L22 for WAF reasons so I'll probably ultimately end up with an L12 closer to the listening position, and really a pair of JS
-12s would have been better. Live and learn.