"But they still need a baffle or sound waves will cancel."
Are you familiar at all with Alon/Nola speakers? Those models that employ the dipolar topology for the midrange and tweeter drivers have the drivers mounted on a baffle.
The Alon line had a seperate baffle of the mid/tweeter driver array mounted on top of the woofer enclosure but the Nola line uses a common baffle.
Do a GIS for Alon/Nola and you'll see what I mean or you can go straight to their website: http://www.nolaspeakers.com/
