I have gone back and fourth with the dome tweeter. Now I will make a try in modifying a Swedish vintage dome Luxor that hopefully will be intrinsically flatter than the KEF T27 and the Seas H086 both of which I have been less than happy. With a good response it is less of a problem getting the crossover to work well. If I can tame the peak at 10 kHz I should get a good driver all the way from 2 kHz to 20 kHz.