I have been interested/curious about a single driver full range speaker for a while. I would like to get my hands on a set just to play around with. I see many designs that use Fostex drivers.
Note that Tang Band doesn't seem to get much love. But, I know they do have some very good drivers. I'm pretty sure one of the Philharmonic designs used a Tang Band (I think it was the Slim Towers).
EDIT:
Maybe something like this/these would be worth the time:
@TLS Guy what are your thoughts?
Fostex P1000-BH Horn Cabinet Pair
www.madisoundspeakerstore.com
Complete full-range speaker kits featuring premium single drivers. Simplified design for pure, coherent sound reproduction.
www.madisoundspeakerstore.com