I am going crazy here. I have $800 to spend on a subwoofer. I am demoing the Def-Teh 15+ from the HT shop down the street, it sounds pretty good and can really boom, it should with the big cabinet and 15" driver but I put it next to my JBL PB12 and to be honest they are both very similar, definately not worth $700 IMO. I have read some threads that say the Velodyne ct-150 is very comparable and may be slightly better and is at Circuit City for $499 closeout. I would love to get a 20-39+ but I have no amp and not sure I would be getting any real sound out of my old sony receiver as the amp, plus its tuff to demo them as no one has them. If it is not going to go lower than my jbl than it ain't an upgrade to me, I get boomyness already with the jbl. Is there anything out there that can satisfy my hunger at this price range. I need to make a decision by the end of the weekend, any help would be greatly appreciated. I have a big room to feed, 18 x 30 x 16.