Tom,
I am so glad that you and the others at SVS are so active on the forums. You all keep us on our toes! Please feel free to jump in anytime and correct factual errors. And you guys build very fine/(value for the $) subwoofers. I'm pleased with my PCU. But I had fun trying to outdo it (think I succeeded) with an expensive DIY (15" XBL^2 with two 18" PRs in a 200L enclosure) at least in performance (not bang for the $) for a large 7k ft^3 room. It will be interesting to see the next gen TV-12. Maybe a TV-15 sometime? Or a new design B4.
Bob