I purchased a pair of Koss PortaPros a month or so ago, and for the most part I've been really happy with them.
However, I've noticed that every once in a while for songs with heavy, sustained bass, I get a little buzzing in (I think) just the right earphone.
I use them with a Nomad Zen mp3 player, and it's not something in the mp3s because I don't get any buzzing when I play the same tracks on my computer. I'm not playing them at a really high volume, and I don't use any extra bass boosting.
Is this just a limitation of the PortaPros, or did I get unlucky and get a bad pair? Or is this something that will go away after breaking them in more?
Thanks a lot,