DT-1990 Pro 250 Ohm : Be sure to order a passive filter cable from solderdude

Let me start this with these are the best headphones I've ever used, hands down. HOWEVER, with that being said, my listing of used headphones is short so take my word with a grain of salt.

You can hear the clear difference with the right equipment. My current setup is a Topping E50/L50 paired with the TCT1 TRS Balanced Cables and a passive filter cable connected to my DT 1990 Pro. I also have Klipsch ProMedia 2.1 PC speaker setup out of the SE output so I can use the Line-out function on the remote and switch between the two or play from both simultaneously.

Anyway, I did a lot of reading before I ordered these headphones. I even ordered the Pro 900 X before I ordered these to see if I could hear the difference between these, the Pro 900 X and the DT990 Pros. Obviously, it was quite clear, haha.

Now we know these have a high treble peak at like 8k+ so for those with sensitive treble ears, your problems are solved with the passive filter cable. It essentially lowers the peak of 8k+ down to normal levels and still maintaining the full sound that these headphones have to offer everywhere else, unlike using the harman curve, which does the complete opposite and dumbs down these headphones.

It's really amazing and I highly recommend reading up on diy-audio-heaven about them