[keanex]

The thread was very detailed and concise, it had many frequency response charts. I can't remember much else of it, but perhaps someone here does?

 

[Prog Rock Man]

This one?
 
http://www.head-fi.org/forum/thread/505113/my-theory-as-to-why-headphones-appear-to-burn-in
 
Later on there are various links etc.

 

[keanex]

Nope and IIRC it disproved a perceivable difference in audio.