@curiousjim Perhaps you just don’t like those instruments which produce sound at those frequencies. It’s not your system. I don’t like trumpets live or recorded and if I built a system to make the trumpet tolerable to me, it would be a misrepresentation of what a trumpet sounds like, along with every other instrument or vocal. For some reason, there are frequencies that don’t appeal to me (live or recorded) and I don’t like song that include those frequencies or have alot of energy at those frequencies. Do you enjoy those instruments/vocal live? Does the trumpet bother you if it is at 75 db?
Beyond that I would look at different speakers or dampening in front of the tweeter.