Sony MDR EX 600's. Just found these. Have been in a drawer for a few years. Only used them a couple of times. Bought in Macau a few years ago. Uncomfortable fit. Volume from the right side driver is weaker than the left. Have swapped over leads etc so the right side driver is the culprit. I am wondering if I could have a fake pair? Is there any way of telling with these phones. Unfortunately i no longer have the box or paper work any more. The MDR EX 500 that i use as my run around certainly sound a lot better to my ears and certainly fit much better. Any ideas anyone?