Besides applying Duratex, my two 18" subs are complete. I tested them today with Thor and Transformers. The only calibration I did was with Audessey. I'm blown away. My old sub was a 100w MTX 12". It was very boomy and just made a lot of noise.
I'm not sure how loud it actually was, but my Denon 4311 volume was set to 0db. While watching a scene in Thor, a piece of plaster from the ceiling fell onto my shoulder. LOL
When my wife came home, I was watching Transformers. She came in and said she could feel the bass while sitting in the car in the driveway. No way, I said. I still don't believe her.
I need to figure out how to properly calibrate these subs. Audessey wants to turn the subs way down. What has me worried is I was seeing the red clipping lights come on on the NU6000 DSP.