It would be cool if you could use a passive baffle step on the woofer to get the high end 9of the woof) down level with where it measures at 30hz, then crank the HF down to match.....you would be basically flat to 25hz!!!
Here is a measurement of what I'm pretty sure this is the best sound I've achieved so far. LF is active, HF is active plus passive CD-comp. and a broadish passive notch at ~1400Hz. Measurements are accurate above approx. where the vertical yellow line is. I believe the bass actually levels off at what is 110dB on this graph:
The acoustic slopes end up like 5th order Bessel on the woofer and 6th order Bessel on the tweeter, not quite at the same point. In other words, there ain't much overlap. I will be trying a 2nd notch on the 2.5k peak to see if that's audible at all.