Well the short version is I have slowly moved up thesubwoofer ladder. The list of subs is DLS 10", Sony WM40, Jensen JS1000, and Velodyne cht-150. All have been good subs in their own right with the Velodyne being great but I now understand the SVS hype on the board and where it stems from. I received a 20-39PCI tuned to 17hz and it feels like the first day all over again. I now feel the bass so much more than just hear it. The SVS really struts below 25hz. Not even the Velodyne could keep up here. Hearing really good bass for the first time is amazing to say the least. Thanks Tom V. for all of your help. And you are too modest! Your product is top notch ahead of the rest. The best $600 I have ever spent period!!