I have almost come to my final decision, it is between the Definitive Technology Supercube II or the SVS 20-39PC+. Both subs are in the same price range. I can get the Def Tech for about $800+tax, and the SVS is about $830 shipped. I have heard everyone rave about the SVS, but I've actually heard the Def Tech, and have yet to hear an SVS. I love the sound of the supercube though. I did notice a pretty big difference between my 2000's subs and the supercube (I currently own the Definitive Technology BP2000TLs(mains), C/L/R 3000(center), and BP2006TLs-surr). It was a lot cleaner, it sounded stronger and I felt it a lot more. I was just wondering what you all thought about the 20-39PC+ and the Supercube II (in comparison).