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The burn-in requirement is real. I was incredibly disappointed with mine before burn-in period. Uneven response, no bass, harsh high frequencies. Have had them on continual play for about 10 days now and they are starting to sound pretty good. They still don't have the bass that I expect, but the mids and highs are calmed down and I actually enjoyed some music with them today.
On the plus side -- wow, what air, what presence with these phones! My Beyer DT880s seem claustrophobic comparatively. There's a lot of detail there too. Was surprised to hear a hidden tremolo in Annie Lennox's voice on a song I've heard a thousand times. Just looking for some more bass, which may get better with further burn-in, but is probably an amplification problem.
I agree about burn in. Maybe not all transducers benefit from it to the same degree but a simple A/B test confirmed what I expected. I had a pair of K712 that had hundreds of hours on them. I loved them. I bought the K7xx to see if their sound signature was similar or even identical, for myself. As soon as I tried the K7xx, new, "out of the box", I could easily tell which one I was listening to, even blind folded. I put the K7xx in a closest with music playing through them for 100 hours (give or take) and I could no longer tell them apart. YMMV.