My experience with JL subs is short but this is what I suggest:
Get 2 or more thick comforters and spread them on the floor in front of your speakers & subs. See how that sounds. I do not know what sonic accessories you have? Bass Tubes? Carpets? If none, then those bare walls and wood floor will echo. Try the comforters or a large area rug and see the difference that makes. I don't see anything hanging on the walls, but the comforter trick is a quick and easy way to test what sound deadening will do.
Get the Subwoofer setup disk from Soundoctor.com.
http://www.soundoctor.com/
Read:
http://www.soundoctor.com/whitepapers/index.htm
Call Randy Weaver at JL Audio tech support. Just call the main number, hit tech support prompt and he usually answers. He will spend a long time setting up the subs properly and answer any questions on placement. But first get the disk from soundoctor.
GET A CR-1 IS A MUST- as soon as you can
YMMV
Fred