Just so everybody knows, dakanao has been on my ignore list for a couple of years, so I'm not interacting with him anymore.
Plus his post doesn't even make any sense anyway. In my post I was only talking about bass impact (not bass depth). IMHO the HD 600 and the Sundara both lack bass impact for different reasons that have nothing to do with their FR, with or without EQ.
So like I said, maybe the DT 1990 Pro could do better impact-wise, if catom can tame their treble (which literally means 'by EQing them' of course).
I hope that makes everything clear for (almost) everybody.