I currently have two Velodyne ULD-15's. These units are two of Velodyne's older products, but at one time was their top of the line subs. They have a very "musical" warm sound, and never wimp out.
On my "wish list" is the new Velodyne "Digital Drive" Subs. Not only do these new subs come with Velodyne's 1250 Watt built-in amp, but has video out, digital E.Q., a microphone, and a dedicated remote control. They can be "tuned" to smooth out peaks and dips in the bass region, and be made to sound great in almost "any" room! No need for an external "BFD" (parametric equalizer). One of the current Home Theater magazines (I can't remember it's exact name) says this new Sub is as innovative as the invention of the airplane. No more "boomy" bass, or "dropouts".
Personally, I'm drooling just thinking about them, but at $4000.00 MSRP for the 15" model, it will be while before I can get a pair.
I currently have an Earthquake Supernova MKIV 10" and a HSU STF-2. I used to have a Mirage MS12.
Like Rutgar, that new Velodyne sub is my "dream sub." I read about it in some home theater magazine 2 weeks ago. There was even a pic in the magazine, showing the frequency response graph on a TV monitor and where adjustments should be made. That's extremely user-friendly, neat & cool for lazy bums like me. But damn, at $4,000 a pop, I'd need to skip a lot of lunches. Make that breakfasts and lunches.