When I first put on these headphones I noticed that around 7-9khz there was some really nasty frequencies going on. After letting them burn in for just a few hours it was less nasty. I think I would have preferred if the cut wasn't there or at least a few khz higher like the m50x before cutting? Overall I like how these headphones sound and will probably keep them. You also get a lot for only 77 bucks. The extended frequency responses is nice and I like how neutral they are. I think they'll probably sound even better over time. I would recommend. This is what I expect headphones to sound like.

These are my first pair of headphones since almost 10 years ago. I am used to using studio monitor speakers to judge microphone frequencies. This headphone has a similar mid and lower mid frequency response to a Blue Baby Bottle microphone. Had I known this I would have never bought them. They also have the "sennheiser Veil" This means at around 9khz it drops off the map all the way until 20khz past human hearing. Basically this has a worse frequency range than a shure SM58. No top end frequencies. Overly pronounced lower mids to give it thump since it cant reach sub bass below 100hz. This seems to be a pattern with open back headphones. These are not good for anything other than a toy. It's hard to enjoy these knowing that everything sounds like it was recorded with a Blue Baby Bottle microphones. These are like the opposite of a V shaped headphone. I decided to buy DT770 and sell these. Hopefully I like the DT770.