If its only showing up in the media player, check that you havent enabled the 5.1 button in the the top right of the player. This can really screw with the sound and entire frequency ranges can be lost. I'm guessing this is whats happening.
The default headphones work fine for me if a little tinny, but with my Senheissers, the results are very pleasing. Apart from a slight gap between tracks that should seemlessly play through, I prefer using it to my iPod Touch. Being able to change tracks and volume without unlocking is a nice feature.
I threw my iPod headphones out years ago, they're the most ridiculous design ever, with the cable tapping the inside sleeve all the time when you walk or run.
Samsung Galaxy S II - Android 2.3.3(XWKF3)
Views expressed here are my personal opinion and do not necessarily reflect those of my employer.