I've had my DT880s for about 3 years, and they have been great, but recently, I noticed that they have developed a channel imbalance. If I play this file http://www.sensaphonics.com/test I notice that the high pitched tone is slightly to the left in the stereo image, and the low pitched tone is all the way to the left. The bass frequencies are almost non-existent in the right channel.
How would I go about determining if this is a cable issue or a driver issue? I would feel comfortable doing a recable myself, but I don't want to bother doing all that if its really a driver issue. I measured the impedance and I get 653 ohms on one channel, and 650 on the other. They are the 600 ohm model. Thoughts?