3 weeks ago, my Sennheiser CX-300 started to acting weirdly on the right channel. With each listening period passing by, the volume was going lower and lower, till to the point that this channel was barely audible. I tested them with different sources and I faced the fact that this problem couldn't be undone. Even if I threated them carefully during a whole year, I could just say now that they are completely dead, due to some sort of driver failure. So, I rushed out to buy a new set on earphone and I decided to pick a higher end one, a brand new pair of Shure E4C. God I was happy, having finally sound in both of my ears. I listened to them during a 2 hours period. When I was over, I folded them back in the carrying case. The day after, after plugging them back in my ipod, I just wanted to cry : the left channel was inaudible to a point that I needed to boost the sound to the maximum in order to ear something in the left channel. I tested them back in different sources and the same thing happened. After 3 hours of testing on different sources, I thought they were completely damaged. So , this morning, I tested them back in my macbook and, to my suprise, they are working 100% like the first time I tried them. Now, I'm thinking, could my ipod have some sort of voltage problem that could do such irreversible damage to an high-end earphone ? I just can't find another explanation. Should I go to the genius bar or ask for a repair online ? I just don't know how to prove this awkward problem to a genius at the bar. I won't be plugging my shures in this cursed ipod , that's for sure !!!! I don't want to lose $200 +++ over this. Please, help me.