I'm thinking about converting my AL-III's into true dipoles for the bass as well as the ribbon, and eliminating the subwoofer box.
Take a look at the Tymphany LAT-700 sub woofer. It has some unique design aspects, and it's specs look like it could be massaged into dipole use pretty easily. It's only 8 1/2 inches wide, and looks COOL! I mean COOL!!!!!
We'd want to add wings, sides really, on the bottom of the AL-III to extend the low end, and to act as a support for the speaker too. You Platinum/Silver guys already have the width.
Qts. is .65, so some crossover tweaking will be called for, at the expense of efficiency. Alternatively, it could simply be bi amped and equalized actively. An extreme measure, well for me, is to use it as intended, and just load the rear wave into the sub woofer box. That wouldn't be nearly as much fun, and loses the benefits of dipole radiation. Besides all of that..these things look COOL!!
Just think about it!