Selling my HE-4 as I really need closed headphones for my listening purposes and living conditions now. So DT770 stay. I know I never got to listen to the HE-4 at their full potential, but I'm sure if I did I would never let them go so that would make it very difficult haha.
I dont think the 770s will be enough. So, the only way youll be happy is to develop a truly magical he4 closed mod. I heard from somebody that told someone else, you were the one. So it must be done!