AKG 553 have treble issues. The O2 isn't a very nice-sounding amp, but I'd wager that it's the 553s at fault.
Thank you all for the advice! This is my office combo which I don't listen to much. I'll see who wants to take the 553 at work.
It's not a matter of who wants the 553. It's a matter of whose hearing is damaged enough that they'll still consider you a friend after you give them the 553.
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