A few extremely preliminary subjective first impressions.
2 PB13-Ultras, L and R corner placement, 2600 cubic feet witrh two double door size openings into about 5400 cubic feet, timed with receiver disance setting only, 80-Hz x-o, SMS-1 to flatten response, PB13s in 15Hz tune.
Tom, you've been practicing and it shows!
To my ears, just a little overdamped -- I know you had resons for doing this -- probably as good as you can get without other issues.
For folks who don't know me, a review of 'just a little overdamped' is high praise.
The result is sound that I can best describe as "professional" -- this is hard to achieve requiring both power and control.
Better than the TV12-Ultra? Yes.
Power? Anyone who has the Pomp & Pipes HDCD, play the 9th cut starting at about the 6 minute mark. Seemingly effortless power and control, resulting in the most realistic reproduction I've yet heard of this cut.