I will do that. They suggest 1-1.5uF cap for use with a pair of their FE208 Sigma drivers.
What doesn't make sense to me is that the calculated crossover (3db down point) for that is 2k Hz and the tweeters are down 106dB at 2k Hz. (Edited, I had the roll off wrong)
Calculating at 0.1uF the crossover (again, 3dB down) is at 19,8943 Hz and flat at 198,430 Hz. But I have tried 0.1uF and the tweeters functioned well. They are easily audible.
So the calculations don't seem to work as I expect. It is confusing.
But forget the calculations, I'm trying to please my ears.