No, nor will I. I view those sorts of mods with a fair amount of skepticism. First, if it's so easy to make the headphones more "musical" and detailed, why wouldn't Beyerdynamic have done that themselves? You'd think that after thousands of man hours of research they'd have realized that simply removing some foam or resizing the venting would drastically improve the sound. My skepticism is deepened further by the fact that they've performed the same mods on the HD 650.
Second, even the OP claims that the sound won't be for everybody, that it requires EQ to sound good, and that it's now more or less completely unforgiving of equipment or recording quality. But then s/he also claims that somehow these issues are fixed by using a balanced cable. I don't buy that. They also admitted themselves that "whenever you tune sound using foam and membranes you also take away alot of details," which sounds like precisely the problem they've reintroduced to the headphones.
Also, I can't imagine the DT 1990 being at all enjoyable with more detail or with the treble being more "alive." Also, I don't find the mids on the DT 1990 to be in any way inferior to the HD 650. Slightly less forward, sure, but not less "transparent" or "airy" (I'm really not even sure what either of those things means in this case, and-- to risk of sounding like a complete curmudgeon-- I'd be surprised if that OP does either).
If people want to play with their headphones, retune them, mod them, or whatever, that's fine. That is 100% their prerogative. But I'm going to continue to view that with a skeptical eye, especially when they don't seem to be very clear on what they've achieved.
PS-- I realize that some of my quotes of the OP might not be exact or correct. I'm trying to write this in my phone and it's a complete PITA trying to toggle between tabs and remember what they said. The sentiment remains the same and I'm just going to have to say, "good enough."
