If you scroll down the page on the Classic Audio Reproductions Contemporary Line page, you will see the T5. These look like traditional box speakers, yet they are 94dB and 16 ohms. I don't believe the T5 use a horn, although the T3 do...and they don't look like traditional horn speakers either.
Have you heard those speakers, Grant? The ones they had at the show that I was responding to were from their "Classic" line. I did not see the "Contemporary" line there(or perhaps I just didn't notice them as the Classics have a very commanding presence). Certainly neither would not fall into any 10" wide limit though. Coincident is a good call. Vienna Acoustics Mahlers perhaps, those also sounded great and are very capable of room-filling sound. Neither impressed me more than the TADs though. Can't recall if they'd fall into the 10" limit, but they'd probably be close.