I understand that absolutely, and believe me, there's plenty of people committed to the crazy. In that regard, we are fully copacetic, and I would gladly tip a beer with you to toast the eschewing of the crazy for a facts based focus on audio!
Previous to this, I'dve said it was an overstatement that there'd be HUGE changes to a 50mm driver. I've experienced it in 12" drivers... but the surface area is WAY bigger, it's a way bigger driver. Sure-- makes sense. I've even seen weird anomalous frequency responses in other cans-- but they generally work their way out. Who knows.. manufacturing tolerances? Bits of glue? A general limbering of the suspension? Not truly sure.
Haha.. but Florianski, this defied my expectations. Of course-- everyone hears the tale of HD650s being lovely and open and lush and wonderful. And they are. Just not initially.
What happened? I can't tell you-- yes, they worked, they played sound, they did in fact move air, but there was in my opinion a vacuous sucking of musicality... taut, infinitesimally small soundstage, bright, cloying, nasty, upper midrange heavy, all low bass, no midbass, no upper treble. In fact it made me miserable to put them on because for an open backed headphone, it felt as if wasn't stepping into a big broad world of music, but a narrowly fitting box on my head. Made an impression, didn't it? It sure did. I'd like those initial hours of hearing damage back, and will be billing Sennheiser forthwith.
Currently I'm listening to them, two weeks later after a week of white noise, and another week of playing actual human music, and it's a much more vivid 3d presentation, with full frequency range, and sounding very much like they're described by people who like them. I am now glad to say I agree.
Do I have a full grasp on the actual dynamic afoot? Nah. But my visceral reaction as a musician of 40 years kinda puts it in perspective that I'm not believing in this for the sake of backing up an audiophile myth, and believe me, I'd rather be listening than putting my brand new cans in a box with a blanket on them and blasting white noise, right? I'm sure they'dve gotten there if I just played music, but as ludicrous as it sounds, I'd ask you to suspend your disbelief for at least ONE pair of headphones- 'cause truly, these 'broke in'.
Believe me-- I know there's mythologies- and this isn't a case of suspending cables on stones, magic power cables, cryo'd cables or tubes or even just the power of suggestion. That sound initially wouldn't sell many cans, I promise you.