Which music are you listening to?
Which artists, genre?
Everything else comes in second place to this. If it's popular music, x-factor stuff, popular rock then you should hear that bump in the 8k range as that's where the vocals are. For playback on radios, car steroes, TV's, standard HI-FI's and ipods, that's how it should be just so that the vocals can be heard properly amongst the mess of everything else.
It's weird though, as when i first got these they seemed to sound quite balanced. They have gotten louder and more harsh during the week i've had them.
I admit that some of the songs were brighter out of the box than with my previous phones (Sennheiser CX 150) but now everything is so bright that it make my ears hurt. Not fun