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Audio Myths... A mostly civilized discussion
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I would just discount the entire burn-in thing. Sure, there'll be changes due to the mechanical action of the device in use, but one can argue, seeing that "burning-in" is an entirely uncontrolled, randomized process, and if it can potentially 'improve' the sound, the opposite should also be true. You could have a device that happens to be manufactured very close to dimensional perfection and playing the device actually knocks lose some of the assembled precision .
But how is it we've never heard anyone saying that their headphone sounded terrible after x hours of burn in? I would just say the differences in sound quality is probably so low it's negligible that we can't really tell if it's become better or worse and any perceived improvement is likely placebo.
Well, one could argue that the headphones were designed with the burn-in in mind. They are certainly designed with movement in mind. It is also reasonable that some parts will be stiffer when initially assembled. For dynamic headphones the diaphragm should of course be as stiff as possible. That is with the exception of any suspension that should allow the diaphragm to move as freely as possible. But the movements would make some difference in the beginning. I certainly wouldn't compare this with burn-in of cables as an example.