Main speakers are older Joseph audio perspective not current perspective 2. I have not altered those yet and don't know if I ever will. The speakers I have been playing with caps are LSA Statements floorstanders. LSA had 3 versions standard, signature and statement, the statement has ribbon tweeters. I've owned these LSA's for 15 or more years and always enjoyed them. After adding new caps they are now much better speakers. I also have some Usher tiny dancer and some GR Research hot rodded monitors which are the speakers that got me interested in changing caps. I've not had any fatiguing issues with Z's even with ribbon tweeter.