I might have overstated when I said "a lot", but the treble is overpowering on a lot of my favorite songs - a few of which also had that problem with HD 558s. Unfortunately with Q 701s it has expanded a little. However, I still really like how they sound/their comfort/etc.
I could probably go for something like the Matrix M-Stage at most (or an Objective2 withholding the awful front-panel design), but $259 is pretty expensive for "just" an amp for one set of headphones.
I had my M-Stage on sale not too long ago for $165 shipped. PM me if interested. I had them with the Q701 personally before and they sounded excellent on the +10 db setting.
Edited by kenshinhimura - 6/20/13 at 5:07am