I've noticed that a weird range of frequencies doesn't play in a few pairs of headphones that I own. it doesn't happen in very many songs but it's a high frequency so it's pretty easy to notice when it doesn't play, like the intro in soundgarden's "the day I tried to live" and the guitar riff of "bulls on parade" by ratm. this one pair in particular that I have works great except it completely silences these sounds... and I know that they have not been damaged and I know it's not the music player so I cant figure out whats up. has anyone else had this problem?