I am on a 2011 MacBook Pro and when I connect a pair of headphones (my brand new MDR-V6s to be exact) the left headphone sounds a lot louder than the other one. Weird. So I try my headphones out on my iPod and Cell Phone and both headphones sound equally loud on both sides. It's pretty annoying not being able to really get the effect of listening to headphones when you can only really hear out of the left headphone. Is this an issue that is worthy of sending it in?