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I have heard of the "Sennheiser veil" and it is also present in the IEMs FWI read. And as Fau pointed are not getting that bright and clear SS with the HD-600 however you are in your other phones. Which means that it is a good possibility its the headphones.
So you have finally been introduced to the HD-600 "Sennheiser veil" and laid back sound signature...![]()
...because it's impedance is like 3x - 5x higher than great majority of other headphones...
...and, I'm afraid, you very likely are into bright(er) headphones... Try K-701 that you've mentioned, try HE-x orthos, try HD-800... not so much LCD-x.
NFB-11.32 sound will settle, but it will never change so much to substantially change headphone "signature".
All IMO.
I have heard of the "Sennheiser veil" and it is also present in the IEMs FWI read. And as Fau pointed are not getting that bright and clear SS with the HD-600 however you are in your other phones. Which means that it is a good possibility its the headphones.