I hope this isn't too off topic but this seemed like a good topic to post this in, so apologies in advance. I've owned Beyerdynamic DT 1770 headphones for about 4 months now. I'm using a Little Labs Monotor headphone amp. These are my first headphones, coming from 2 channel speaker setup. The first month or so I was very happy listening to them. From reading, I got on the idea of trying to eq them. I'd also recently started using Roon which has what I think is pretty good built in eq functionality. To make a long story short (or a short story long), I eventually came across eq presets put out by someone called "oratory1990". If you're interested you can find more background information on him and what he's doing. He provides eq presets based on measurements he's done for quite a wide variety of headphones, including the DT990. I've briefly tried other settings published or suggested by others, as well as my own and these are on a completely different level. I'm actually surprised they're free. The full list is available here:
Using his presets, entered in Roon's PEQ settings, has transformed my DT1770's completely. To try and describe in detail I believe would be pretty pointless but suffice to say there's no way I would want to listen without that eq enabled. Roon allows you to enable/disable very easily the PEQ filter so anyone should be able to try and make a decision for themselves if interested. The change is not subtle and for me took some adjusting to. Initially I felt it was too thin sounding, especially compared to DT1770 with no eq.
The final step for me was enabling the Roon Crossfeed filter. There's three different settings provided as well as a custom setting. I've tried all three of the pre-loaded settings and found all three, although all are subtle to me, to be the icing on the cake for me as far as listening enjoyment. I'm currently using "Chu Moy's" settings with the oratory1990 eq preset for my DT1770. Before trying Roon crossfeed I found I would get sleepy and sometimes even fall asleep while listening for any length of time. With crossfeed enabled, I have no problems listening for hours. The only problem now is life interferes with my listening.
I'd be very interested in hearing any experiences from others if they decide to try any of this. If you think there's something about the sound of your headphones you may not quite be satisfied with, you may be pleasantly surprise what you can end up with by using eq and/or crossfeed. I guess I should add that the DT1770's are closed headphones which has made me wonder how much that has to do with the success I'm having with crossfeed. Also be very aware of possible clipping being introduced by using any dsp like eq. Even with Roon's "Headroom Management" enabled, which defaults to -3 dB, I still noticed some clipping with Roon's clipping indicator. It wasn't noticeable to me during listening but I did fine tune the Headroom setting to eliminate the flashing red clipping indication just to avoid any potential problems.