1)
Unfortunately, I do not. That is a very good question. It is likely that I will have to trust the design of the crossover that I choose,...
2)
Looks like this may be over my head. I am a builder of speaker cabinets and 'proven' electronic kits. In the past, I have been fooled more than once.
If you have been fooled more than once (2), it seems like the tools (1) could start percolating up in importance...
Would it be easier to go with an active XO design? and then the crossover slopes and delays can be done without solder and electronics… or is that not as good?
If it is those wu18 SS drivers, then they are pretty renowned.
What are the dimensions of the horn loaded cabinets?
Do you know how low they go in terms of frequency in that arraingment?
A mic and IO device and REW would be a relatively cheap.
A D.A.T.S. could also be useful in the tool kit.