Mmmm, don't know what happened there, sil180sr, but when I look at the req file that I attached in the post #17, it matches the wacky entries you have shown above. I have no idea how that happened.
I went to the file in my computer as I saved it and reattached it to the post again and deleted the old one.
"Save target" on the 80Hz crossover.req and load it into REW. It seems fine now. Go figure.
Anyway, the file (when it's correct) still looks somewhat like the one you show. For a sub we're interested mostly in the low end up to about 400Hz and then that's it. I did add filters up to 10K, but after that it really doesn't matter.
80 crossover.jpg
brucek