Not that you were asking me but I have owned both the X1 and the TH600, granted at different times. The TH600 for me does not justify the cost. While if the X1 fits it is a wonderful value. Comparing them is hard, especially from memory. But I personally would say if you love the X1 stick with it for your fun can and buy more music to enjoy. In comparing the TH600 to the Denon AH-D line I stuck it ever so slightly above the 5000. But I think the 5000 was the best value closed fun headphone. That was when you could get them for a decent price though, now since being discontinued they are much less a value sadly.
Edited by kcee - 10/12/13 at 7:08am