Cleviebaby:My point about ATC is that, to make a high quality speaker that is viable as both an active and passive design is really challenging and Peter's comments about the 8000 and 6000 design is that it only works because the amp is designed to overcome an extraordinarily limiting shape - the drainpipe.
And precisely why I brought up the Pentas and Panels... they worked successfully either actively or passively and of couse, were marketed in both flavors. There is nothing wrong w/ the drainpipes... both the 6000 and the 8000 are likely the most beautiful speakers ever made -B&o or otherwise. They simply won't do as passives -I agree with that. My suggestion was to keep them active, and perhaps adding some form of ALT.
Back to a new speaker that could be marketed akin to the Pentas and Panels... I think it would be a great idea. The brilliance of these two designs was the simplicity of amping them and making the amps nearly LEGO pieces in the designs of each. The fact that B&o decided to go a pure active route (BV1 excluded) didn't mean that passives went the way of VHS tapes. I think all B&o really ended up doing was to remove themselves from a huge segment of a market that never disappeared.
Design a new speaker as a passive first... make the amp a "plug in" design component. Economies of manufacturing and marketing a new dual speaker can only be a good thing. Speakers are, arguably, the best thing they do.
I'd like to see them return to this market... and PROFIT!