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That doesn't happen based on any of my experiences or anything I've ever read. It could be your source, amp, DAC? I've never seen headphones adjust that much over time with any quantifiable data whatsoever. The TH900s are horribly V or U shaped and that's the biggest reason I eventually sold them (that and the tizzy treble had me avoiding so many recordings).
Sorry i dont have measurement rig ,, all this is based on hearing after leaving the headphone burning for few days ,
first day i thought they are worm and dark with a little bit emphasis on the bass ,, yesterday was a different story ,,
after listening for hours ,, i had pain in my ears ,, so i did EQ based on experience (in blind with measurement)
the best result for me was lowering the 6-7k band and the pain is gone and the sound was a lot better and like the 1st day
also i lowered the bass to get a better mids that i was loosing with the bass .
btw some headphones do change after burning ,, for example AudioQuest NightHawk do get bright after 100hr
HE400 had some distortion without burning , sure not all change notably but its a fact ... burning change headphones ..
regarding the TH-900 , yeeh for sure its V , U shaped but with some recording it get very pronounced
what i hear now with the Z1R is recessed mids all the time , so i have to crank the volume to enjoy these mids.
I think i need the full copper cable to tame the treble ,, i never liked the silver , silver coated cables ..
Really? I just think it is more resolving. The measurements didn't show that peak if I remember correctly.
What do you call recessed mids ? for me i have to crank the volume to enjoy these mids , its not resolving issue ,, not at all ..
btw i love these headphones , dont get me wrong ,, i think they are amazing ,, just need some EQ to fully enjoy them with my dac and amp and ears
am sharing my experience , maybe am wrong ,, and something is wrong with my setup , but still its true to me as day and night