I just picked up a Velodyne DD-12, and let me say that this was the most significant upgrade that I have done to my system. I have a very difficult room, bass-wise, and the ability of the Digital Drive series subs to not only analyze, but also correct for, such room characteristics is nothing short of revolutionary. Combine that with a very fast, musical sub that absolutely disappears, and it becomes a tough act to beat. Don't shy away from Velodyne just because they also make more affordable subs. The Digital Drive line is very much a "must audition" line of subs.
Tom.
Tom.