DT 990 PRO

I use a lot of headphones. The DT 990 Pro are absolute classics, or rather the DT 770 Pro (the closed-back version). The famous Beyer peak persists even today. I don't like it. That's why I've improved the sound using Peace (the GUI) and Equalizer Apo. I use the Oratory1990 presets in Equalizer Apo.

Regardless if the sound seems flat, the frequency response is far from it. I'm using the DT880s myself and while they're a bit more neutral in this regard, they still benefit from something like CanOpener or SoundID Reference (using the latter).

Unless you are 100% attuned to your headphones, you can't just mix with intuition. If your instinct is out of alignment with the actual sound of your headphones, you'll always have translation problems. Correction profiles attempt to help with that by smoothing out peaks and valleys in the frequency

I have the DT-770 Pro 80 ohm, so mine will sound a little different from yours. You have the leatherette pads, right? I have velour. So it's likely you have more bass resonance due to the leatherette earpads, which is probably why you perceive less treble. Really, you're just perceiving more bass! :

Haha, the "beyer peak" - it's not subtle. If you have it, you notice it. =) Are you sure you have 32ohm headphones? What ohm does it say on the side? Looking at Beyer it states clearly that 770 Pro 32ohm has leatherette pads, and 80 & 250 ohm have velour: https://north-america.beyerdynamic.com/p/dt-

It isn't often that I hear people describe the DT-770 the way you did in your other comments, but it mirrors my experience as well. I believe part of it is that we have the 80 ohm edition. 80 ohm has a two-part coil instead of three, resulting in less sharpness which Beyer is commonly known for ...

In my experience the long straight cable of the DT-770 80ohm has some issues with physical transfer of noise. Luckily it's ridiculously long, and you can braid it like this: https://www.reddit.com/r/headphones/comments/1lpxhqi/got_a_new_dt_770_pro_cable_was_too_long_so_i/ The coiled Beyer cable is much better