Looking to build an enlcosure for a single American Bass XFL 1222. Max dimensions are 40"Lx18"Wx14"H. That is a tight fit with a dual prefab enclosure. This will be pushed by a SoundQubed Q1-1200D. I pulled the specs for the XFL and recommendations I have seen ina few posts online. This being 2.2cu ft @ 33Hz. Is this acceptable? Suggestions?