I understand, but that was not my point, Definitions use Subwoofers on the back, so what else would they do to satisfy no subwoofer anyway that you are asking between the Druid and active Definition? I mean unless they run an active sub system with the druid nothing will solve the issues you are asking about.. minus the slim chance they would put a standard passive woofer system with crossover to be driven with the FRD full range driver in a single cabinet and come to a more conventional design, maybe bi-wire capable posts on the back..
Now I am coming to the conclusion that the Druid if placed at the 5500.00 mark and this discussion would not have existed and everyone would be Happy with the Tone on the low end the Druid at the mid point, and the Definition at the high as long as the numbers matched up?... That is just standard progression then.
So bottom line is your interest is not in Zu speakers, but in something that is not a crossoverless Full range system, so there is no void to fill in this type of design, see what I am saying? Now I could see them putting the definition front array by itself but you will still simply achieve the same as the druid with better dispersion and 3db better output maybe this is what you are looking at. So I am not sure what is being asked. But yes it was just to play devils advocate, I don't think much will be done that cannot be done now with the current Zu combos unless they have developed a whole new system using nothing like the drivers they are now, maybe a dual 5 inch full range or some other drivers completly, or simply a CUT in half Definition, 1 Full range, 1 Super tweet, Dual 10" instead of 4 10", but again this would be the same as running Dual Method Subs or even a Single with the standard Druid. I only jumped in cause I have interest in seeing what you guys think would be what is missing due to I can't figure what would solve this for less money than just adding the single subwoofer, AGAIN the definition is simply a 4 Driver sub system with set crossover electronically just not adjustable.
I am not a designer and I am sure nobody here is, but like I said if you were working with a handfull of Scan speak drivers with multiple crossover parts sure anybody can come up with "Bridge the Gap Models",,, I just don't see what to do beyond them eliminating the whole FRD driver system in the first place and it would not be the same style anyway.