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Use a large electrolytic to push any FR effects way down low and parallel a nice normal xo cap over it to keep ESR down low. As others have said do all measurements for xo design with the cap in place first.
I recently very carefully compared the Fq responses in SP level signal "before and after" the protection capacitors as shared here.
I highly recommend you to use "proper" protection capacitors for your treasure mid-range drivers, tweeters and super-tweeters.
I am using these, 68 microF Caps for Be-midrange squawkers, 10 microF Caps for Be-Tweeters and metal horn super-tweeters;