I need to get rid of the encircled part:
Just in case, the measurements are attached. Unfortunately, they are in dBV and not dBSPL, but from using these in the program, I do not see this is a problem when I set the target at the same levels. I have already tried one of the circuits in XSim and it seems it will work pretty well.
I will try to extend the range above 20 kHz.
I have another question - the generated crossovers without common ground tend to have a little less components in total - is that correct? Is there any reason not to use them? I have not seen this before, it is not very common as far as I can tell.