"unravel much of the high frequency mix"
The crescendo at the end of 'Bridge over Troubled Water' comes to mind. It took a while for me to build a system that was resolving enough to 'unravel' it well. Recently, I was surprised that dynamics were improved even more when swapping positions with existing power cords that had been in my system for years. LOL!
Also, cross-overs are probably involved with 'unravleing'. My Acoustic Zen Adagio Jrs (with a powered sub) started out as mellow speakers. Not any more. Bill Baker's (Response Audio) custom cross-overs changed that.