Sorry in advance for the long rant:
The is TLDR is : I rage sold my DT 1990s because my new HD600s are more detailed despite every reviewer out there( except for the headphones show guys) gushing all over them and the supposedly supreme detail.
I just sold the DT 1990 I had for three years. At the time I was looking for the most detailed cans for less than 500€ and I bought them mostly on Joshua Valour's advice ("detail everywhere, extremely well balanced") but also Zeos's and many others who gushed about the detail retrieval and didn't seem to have a problem with the FR.
Only tho discover that the frequency balance was super wonky and every song not metal or electronic sounded wrong. But hey at least they're the most detailed cans I can get for my money -I thought- and they were indeed the most detailed of my collection.
So I kept them, changed the pads and added foam to boost a little the lows and tame those wild highs. One year ago I started to use EQ and was happy with them.
But then I bought a pair of used HD600s because they're such a classic and a neat addition to my collection and they were a little bit more detailed in the highs and instrument separation was also better, I was so surprised and felt ripped off, so I rage sold them!
The worst thing is: I'm all for bright and uniue FRs (I love my K701s and SR325x ) but the DT 1990 truly are so unbalanced that they're unusable without mods or EQ or hearing damage! And the detail is average for the price despite supposedly being their main attribute. I miss a little bit that sweet bASS tho luckily my iems got me covered in that regard.
So where does all the hype come from?
Ps: I really tried to love them because of the great build and the looks but come on Beyer, get yourselves a dummy head coupler already, for our ears's sake! (I've heard the new ones are better in that regard)