Originally Posted by subyguy
Heres the result of my build. Basically the same box beast built with the bet 10=CX, D220TI CD and the stock eminence 1600Hz XO. I measured with my omnimic with the speaker sitting at the edge of my sub 30" of the floor with the angled baffle facing up. Definitely an ugly curve but for a rear surround I'm OK with it. It actually sounds very good and part of the issue could be my measurement setup. I used an adjustable l-pad to tame the CD down and pretty much have to turn it all the way down to not have it way too bright.
You should measure the drivers seperately also and overlay.
Then compare with the summed response to see if you can pinpoint the issue....
Just looking it seems the woofer is not crossed high enough order and some of its "junk" is still showing,
The CD is turned waay down which is likely the cause for the gap once the woofer tanks.
EDIT: You also might try swapping polarity on the tweeter to see if it helps the gap.