Jackcrow,
Although there are actually two Ampeg 8x10 in the rehearsal room besides my own, I have not yet compared the two to my Super Twin. Maybe I'll do that tonight. What I can tell you right now is, with my Orange Terror Bass 500, I could EASILY drown the rest of the band including the drummer. And when it gets crazy monster loud, it never loses its low end. I played it in small to medium sized rooms (a big stage gig is coming by the end of october), and outside on a school yard with no walls whatsoever anywhere near. I have never sounded close to this good before when playing outside, absolutely no lack of fundamental/bottom, and easily loud enough without pushing the amp at all.
The last big stage I played with the Super Twin's smaller brother, the Super Compact (I had that one befor I switched to the Super Twin). I chose to play over the Compact even though there was a huge Ashdown 15 plus 2x10 fridge right beside it. The Super Compact was easily as loud and sounded deeper and more round, plus more defined. For the Super Twin, multiply the results....
Best
Sidecar