On "Burn In"
I pulled the trigger on these and noticed the booklet said they should be burnt in 150 hours. I was agnostic about this, having always bought used or factory burnt in HPs. But I thought I'd test it. I can say, I was hoping it was true, because they sounded different (worse) than the store's demo model, but thought that could be the DAC/amps. (Store was running Modi to Asgard, which are "warmer", whereas I was running SDAC to Atom, which are more "neutral".) Long story short, burn in is quite real for these phones. It doesn't take the full 150 hours, but it is an obvious difference. There is an objective-ish part I can mention to strengthen the case, which is that treble extension plus high energy for me equals immediate ear pain in my right ear. It's why Beyer T90, Focal Clear, etc. are off the table for me. And out of the box, the Arya triggered this on any track with jacked up treble, and even some more naturally mixed tracks, but 70 hours into the burn in, they no longer did, on anything. Subjectively, the sound became less brittle, sterile, dry, metallic, etc. and the extension and energy calmed down. I also perceived the soundstage to open up (somewhat paradoxically), but I'm less sure if I'm actually right about that. But there was a point around 80 hours where everything just clicked and everything sounded fantastic on this headphone. At this point, I don't think I'd want to add warmth or high roll-off, although on some tracks treble is juuust past the crispness I'd like, which is more an "edge" issue (and a mix issue). I don't know if it's the driver loosening, pads breaking in, etc. but "burn in" is real in this case. Others have similar experience?
Ok, I just have to add: Reddit is a hellhole. I posted a version of the same thing there, and... jeez, why bother. A peer-reviewed study or large sample size blind AB test would be great to figure this out, too bad that won't happen... (I thought the added element of my ear pain made this quasi-objective info.) I'm pretty sympathetic to "objective" positions, but at some point they become the dogmatic, unreasonable ones (see what you've made me say, Reddit?)...