The upper midrange was one of my favorite parts of the speakers performance. Its a popular misconception that bright speakers are bright because of an over active tweeter. Not so, it's the upper midrange which determines the level of brilliance. I don't like bright speakers. Nothing reminds me that I'm listening to reproduced sound like a bright speaker.
Some speakers have that brightness voiced right in because people think it sounds more detailed.
After a long listening session, I'll have less listener fatigue also. Moving on to the tweeter which is the same aluminum dome used in their flagship 3.3, the best compliment I can give it is to discribe it as being without character or sonic signature. OK, I can tell you this, at no time did the tweeter ever call attention to itself. It's not hard, it's not soft. It's not edgy, it's not etched.