Chrisallen,
Voxativ already has several models that feature an active (powered) woofer coupled to wide-range drivers. I haven't heard their speaker systems, but, I have heard a number of different systems utilizing their drivers. The sound of these systems varied widely; clearly implementation plays a big role.
The Charney speaker I mentioned above used a Voxativ full-range driver. Charney offers a choice of drivers. For my taste, the Charney with the Voxativ driver does not need a subwoofer. The sound was full and had plenty of bass. If anything, what I would want is a little bit more extension on top. That is a somewhat strange thing to say because sound a bit harsh and have a prominent peak in the treble range that makes one want "less" on top. This speaker was quite different from the typical single driver experience.