Art K.
The Voodoo You Do!
An exception would be the Spendor SA1 I owned that had a soft doped fabric tweeter. Although the upper treble was rolled off and smooth there was region in lower treble frequency range that I found both persistent and annoying, I've read of one other owner that mentions this, it could have been the cabinet or crossover, I don't know but I did find them tiring to listen to over extended sessions.
I agree about the SA1. Not one of Spendors best efforts. Pretty though.