These are back up for sale. Original ad here - https://www.head-fi.org/threads/sold-fs-audeze-sine-w-cipher-standard-cable.887428/ After selling these, it was discovered these have the known "crinkling" issue. Basically, air gets trapped between your ears and the earcups. The air pressure can cause the drivers to flex leading to a crinkling sound with certain head movements. Apparently this happens with planar drivers, not just Audeze. Some drivers are affected more than others and it varies from headphone to headphone. I did a quick search and it turns out this is actually a documented issue. Audeze themselves have acknowledged this. The driver isn't affected and music sounds fine. I used these mainly while sitting during my subway commute so I never experienced it. The previous buyer for these used these while on-the-go & walking so it was more apparent to them so I accepted a return. If you're not using these on-the-go it shouldn't be an issue. The certificate of authenticity shows these were manufactured on 7/27/16. Audeze offers a 3 year warranty on the drivers. With that said, I don't know if this issue is covered under the warranty, but rather than go thru the whole process of trying to get an RMA, I have discounted these further. Otherwise, these are in excellent condition with no more than 40 hours. Price includes shipping (CONUS only).