Sorry for the blur picture, I only have my Blackberry now and they're notoriously known to have bad cameras.
Anyway 2 days ago my JVCs reached the 150 hour burn mark and they sounded great. I currently have no other pads with me except for my old cheap Sony MDR150 headphones.
Seeing how I'm not going to use them anymore, I decided to swap the pads. The pads are worn out, previously they have a layer of pleather-like material (like the M30 and M50) but they had peeled off. What's left of it is only fabric with little isolation but great breathability, no sweaty hot ears now.
Now the cans sounded... 'right' for some reason. I am a closet basshead, and the first time I got these the bass had really caught me off guard. But with these fabric pads, the bass had tamed down. Honestly I had swapped the pads before, but the results weren't so appealing.
I don't know, maybe it's the burn in, maybe it's just my head playing tricks on me, but what I do know is these pads are a lot more comfortable, though they isolate less, and the sound gets a little more balanced than it had used to be.
Vocals were still a little weird though with some songs have a little recessed vocals while others have more upfront vocals. Anybody else noticed this?
I also own a recabled Goldring DR150. I must admit they are amazing for their price, but now my JVC sounded more like their pimp. Matthew Bellamy's voice coming through these cans is amazing. Smooth as butter on butter while you're skating with skates made out of butter on polished butter floor. Truly hi-fi on a budget. Zee Avi sounded great too. I'll be playing some Julie London and Norah Jones later, with a little mix of Daft Punk, Bassnectar, and maybe Nightwish to test their dynamics.
My impressions are made through flac > sansa fuze > E11 > JVC as my UD100 DAC is still being repaired by the creator because of a broken audio jack, so take this as a grain of salt. I would love to know how they sound with the UD100 now.
Will probably get an Aune T1 later after I get some money from my current project. 24bits of audio love.
**edit - My Goldring DR150 had only gone through roughly 120 hours of burn in, some respectable forummers mentioned that they need as much as 200 hours (one fellow said 300 hours) of burn in to reach its optimal operating condition. I will report back if they have any further sonic changes after reaching the 250 hour mark (between 200 and 300).