As a follow up...I've now tried a single Acme B-1 8ohm cabinet with a Clarus II, a Clarus SL and a Focus. The difference, with a loud jazz trio, is not much at all. I think, maybe, the Focus is a bit tighter and maybe...a bit more detailed. But the difference is small, considering the power advantage the Focus should when driving 8 ohms. Again, your results may be different if you push higher volumes. And most important, all the AI heads, when hooked to the Acme B1, delivers the best sound I've yet played through for EUB and DB. Equally important, this combo is a cinch to carry around. And if you happen to use the Clarus SL, it's even easier. For now, my search has ended: a Focus with 2 8ohm Acme B1's for playing out and bigger rooms (I should be so lucky!) and a Clarus SL with a 4ohm Acme B1 for leaving in the studio. Sure...I'll keep a Briefcase around for "homework."
Hmmmmm, what's out there in new European or American DB's I can try....suggestions anyone? Sounds like I'll be in a new thread...