I am also skeptical about the whole break-in idea. Even with my recent experience with the HE500, I am still not sure if there's indeed a break-in period. I did notice positive changes after 100 or so hours but at the same time I can't ignore other changing factors such as my ear adapting to the HE500, amp switch during the same period (to Emotiva in my case). On the other hand, looking at the break-in theory from a pure technical view point, I also think that it could be true. Any materials that are dynamically changed/moved could take some time to settle into its optimal state within its operating parameters and environment. For HPs, IMO, the diaphragm is most likely subjected to this behavior. Whether we can hear/detect the possibly minute differences between the initial state (pre break-in) and the later is the key point.
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