, where did you get these headphones, the pads look so misshapen? Was it newly bought, or did someone send them to you, what's the story of this unit? They've got some weird grooves in them at the top & bottom for some reason (in the pads).
Surprisingly low distortion. Sensitivity to mounting is not surprising though due to angled drivers. I experience same thing with 560S. 100€ price is huge advantage. These might be my office headphones. Added to shopping cart.
The angling of these "EAR technology" Sennheisers shouldn't cause a big issue in headphone measurement reliability, I measured my HD560s and it's very consistent between roughly centrally placed reseats on my miniDSP EARS (that's 10 measurements & reseats of both left & right channel):
They are also super consistent in how this headphone sounds to me between reseats when I wear them & from listening session to listening session. I really don't see any seating/placement issues & sensitivity re the HD560s. I think Amir's sample of headphone was erratic due to the strange pad deformations - you can see the grooves in his pads, don't know what on earth that is about.
EDIT: just realised the HD569 is a closed back headphone, well that will make it more sensitive to placement and perhaps also magnified by the strange deformities seen in the pads of Amir's sample......but it would be wrong to say the HD560s is inconsistent between reseats in my experience & measurements (and the HD560s is open backed).