So as others have mentioned, how many hours do you have on these? I have serious doubts it has anything to do with magnetically shielded shells. Really sounds like it could be a break-in issue, so give them at least a few hundred hours of play time.
And Johnnyb53, have you actually heard those Audience speakers? I had the 1+1s in my system and also in a friend's system as a double check, and our assessment was they were severely compromised in the upper mid and treble range, right where the OP is already experiencing problems. They sounded muddy and significantly dynamically constrained. At that price range, if it were me, I'd look at the Silverline Minuets. They're rear ported, so that might be an issue, but they're really great speakers at that price level. Or a used pair of KEF LS50s if they become available. Best of luck.
And Johnnyb53, have you actually heard those Audience speakers? I had the 1+1s in my system and also in a friend's system as a double check, and our assessment was they were severely compromised in the upper mid and treble range, right where the OP is already experiencing problems. They sounded muddy and significantly dynamically constrained. At that price range, if it were me, I'd look at the Silverline Minuets. They're rear ported, so that might be an issue, but they're really great speakers at that price level. Or a used pair of KEF LS50s if they become available. Best of luck.