I use ath50x, i can listen music in a very detail way, when i listen the song blacken the cursed sun by lamb of god, at the begining i listen an enoying sound a noise, i thought my headphones were damage but they are ok, then i thought it was my cellphone, but my cellphone is fine too, finally i discovered this was a Poweramp issue.
This is something hard to notice because it doesnt happen in all songs and you will need a good headphones to hear this annoying noise that appears in some tracks.
Please fix, i love Poweramp.