I recently noticed that the channels are not balanced on my Grado SR-60i's. I listened to quite a few different songs and it seems like the singing is louder on the right side. The singing should be directly in the center, yes? I put the left earpiece on my right ear and vice versa to make sure that I was correct. I'm not sure what to do now. It's annoying me to death and I'm past the 30 days for returning them to Headroom. How much would it cost to ship them to Grado and back for repairs?