I have a pair of ATH-M50 headphones where the right side has stopped working. I took them apart and measured the resistance at the L/R terminals on each driver. The good one measures about 35 ohms whereas the bad one is around 200 ohms. Another set of good ATH-M50 measures 35 ohms on both drivers.
Does this make sense for a blown driver? This guy's bad driver showed an open circuit.