Why not horns?

"Horns have unexploited potential. Lets get busy harvesting their potential. Most other options seem to have reached their limits long ago"

Well said and I agree 100%. I will add that the progression of horn technology is the single best hope for getting closer to the dynamics of the live music experience. Lot's of problems getting it right as outlined above including the small market. This technology is not getting R&D funds of the larger speaker manufacturers and is progressing on the backs of a few dedicated small companies and the DIY enthusiasts.

Can someone provide some general impressions regarding the difference between a horn bass, folded horn and a good modern sub woofer(s)?

Is the difference more sonic qualities, room loading or is it that only a horn can keep up with a horn?

Well, alrighty then. Would anyone like a biscuit with their tea? I found the weather a little disagreeable this morning.