I'm a bit surprised to see so many beta testers talk about burn in ( 75, 150 , 200H ) for their HE1000.  WTF ?  I never experienced any serious change after Burn in ( except my brain burn in) except maybe for some Ultrasone and my SE215 ... I said maybe ! and I thought planars/orthos didn't need any burn in.

Am I completetly deaf and wrong ? 

I'd like to think of it as 90% mental adjustment (not really placebo, if you consciously realize that your brain adjusts to things), and 10% hardware settling.

Yeah me neither.  Burn-in is always a positive trait too.  If a headphone is bass-lite, burn-in makes it beefier, if a headphone is treble-happy, burn-in makes it more mellow.

What you won't find is someone saying that burn-in settled the treble of their HE-1000 down, then another user who's a treble-head saying that burn-in caused their headphone to sound too mellow, at least not as much as everybody saying there was a positive change.

I'm taking any impressions of the HE-1000 changing around after burn-in with a grain of salt.

That said, I am definitely interested in more comparisons between HE-1000 and HD800 for image size or soundstage specifically.  I think I'm at the point where I don't think I could settle with anything less than HD800 soundstage.

Burn-in is always a positive trait too.  If a headphone is bass-lite, burn-in makes it beefier, if a headphone is treble-happy, burn-in makes it more mellow.

I had two HA-S500 that sounded indistinguishable with little use, but very obviously different after burn in. It went from normal bass to basshead: not a positive change. Exception that proves the rule though. Carbon nanotube tech? Dunno.

Yeah me neither.  Burn-in is always a positive trait too. 

No it isn't. I've always complained about certain headphones sounding worse over time to the point of even failure. Lots of pre fazor LCD2/3s. Marv's modded Abyss is sounding a little slower these days, we've talked about that before. My HD800 and even UERMs sound worse over the years I've been using them. Only really noticeable when comparing to new units directly. Most drivers have parts that fatigue or wear. 

I know what you guys are getting at but I don't want an oversimplistic generalized view around this forum like you get and some others. Pads also wear in and change sound. Probably better at first, then worse over time. Considering most headphones and speakers using dynamic drivers with rubber butyl surrounds, it's not ridiculous and actually scientifically proven that rubber, like in new tires (most composed of rubber) improve performance after an initial break in as molecules begin taking proper alignment and their modulus/flexibility changes a bit. Eventually long term wear and oxidation take their toll where a more linear and consistent degradation occurs.

These are mechanical devices subject to the realm of physics. You don't get to proclaim scientific objectivity and proclaim headphone drivers exist in a sub-space field immune to physical laws. Just something to think about for those that haven't thought about it.

I also think when people say others always say burn-in improves things, they aren't listening closely enough to what all the people are saying. Maybe this can be alleviated by people saying 'wear-in'.

No it isn't. I've always complained about certain headphones sounding worse over time to the point of even failure. Lots of pre fazor LCD2/3s. Marv's modded Abyss is sounding a little slower these days, we've talked about that before. My HD800 and even UERMs sound worse over the years I've been using them. Only really noticeable when comparing to new units directly. Most drivers have parts that fatigue or wear. 

I know what you guys are getting at but I don't want an oversimplistic generalized view around this forum like you get and some others. Pads also wear in and change sound. Probably better at first, then worse over time. Considering most headphones and speakers using dynamic drivers with rubber butyl surrounds, it's not ridiculous and actually scientifically proven that rubber, like in new tires (most composed of rubber) improve performance after an initial break in as molecules begin taking proper alignment and their modulus/flexibility changes a bit. Eventually long term wear and oxidation take their toll where a more linear and consistent degradation occurs.

These are mechanical devices subject to the realm of physics. You don't get to proclaim scientific objectivity and proclaim headphone drivers exist in a sub-space field immune to physical laws. Just something to think about for those that haven't thought about it.

I also think when people say others always say burn-in improves things, they aren't listening closely enough to what all the people are saying. Maybe this can be alleviated by people saying 'wear-in'.

OK . But what about specifically planars ? I can understand mechanical burn in for dynamics headphones  but what about planars ? That's my question.  We're speaking here about burn in of a new product inducing significant and fast changes during the first hours/days/weeks not wear due to time.