Audiophilepure

https://www.headfonia.com/astell-kern-ak-t9ie-review/

“From a build quality perspective these are very nice. They consist of three separate parts. The bottom shell, the top shell and the face plate. Top and bottom shell are in the same gunmetal colour, but the face plate is slightly lighter. The entire body is pretty shiny and if you are worried about getting your smudgy fingerprints on there, you should be. Because the AK T9iE shows you every little bit of dirt and leaving prints on it is very easy. If you’re like me and you hate that, you’ll clean them every day.

The T9iE comes with an MMCX connection, so you can cable roll if you have a suitable cable on hand. The original AK T8iE had massive problems with its MMCX sockets. Back in 2016 I owned a pair of them as well. After two months they died on me because of a failing socket. Of course the warranty covered that, but still a bummer. With the T9iE it seems A&K/Beyerdynamic is now using a more robust socket. I haven’t had any issues in the months that I used them.”