The more I play around with headphones, the more convinced I am that most of the sonic differences between headphones with similar drivers are attributable to the amount of damping that is applied in front of and behind the driver. For example, the HD580 has foam damping behind the driver and...

There is some good information buried in another thread about the model evolution of Sennheisers. I think I can add some info about drivers. I think it will be useful to branch this off into a new thread. The quoted parts contain info provided by sgrossklass. If you want to see what these...