Listen Up customer here as well. Good luck with the D50. I hope it brings what you are looking for.
How long have you had your H390? FWIW - A'gon member Nutty sent me an SR Purple Fuse for the H390. I honestly wanted no part of that stuff. Some of the fuse threads here just seemed delusional to me. Eventually, however, I tried it. I can tell you, I was pleasantly surprised. The change was immediate and positive. I paid him for the fuse. To my ear, it opened up the sound of the H390. That was back in June 2023. Haven't looked back.

