Sennheiser HD58X - V0N EQ (Patreon)

I was busy setting up the KH80 at my desk. The acoustics is pretty bad here, but I will keep them permanently at this location and need to equalise them to get something usable. The DSP has 8 PEQs included, together with a low and highshelf filter which you can only adjust in gain:

I will measure and equalise left and right speaker separately, the Neumann app is really decent in this regard and when finished do a final check with both playing in stereo.

So far I managed to bring the left one to something flatter sounding, I am still working on the right one. Below you can see the left one default and with my current EQ in black:

This looks a bit better when applying psychoacoustic smoothing:

It sounds way better than stock like this, although I am sure I will achieve better results in my living room as I will place them symmetrically close to the room center. But I couldn't resist and tried improving my latest HD58X EQ bringing it closer to what I hear from the equalised KH80. It's far from perfect yet, it was a first adjustment just based on listening, I haven't done any precise final measurements yet, but I think V0N is already much better than the simulated filter addon I based solely on some measurements. 

Below you can see V0N in black, V1X in grey and in blue V1X + X3000-KH80, thus the final result seems to be something in between although I will need some time to optimise it more. 

Don't ask me about the first 3 filters. I hear some resonances in the response of the KH80 especially when listening from front, which add some realism to the spectrum. I hear some further resonances which I cannot quite track down in frequency, these resonances go away if I turn my head to the side, I will need to recreate those effects more precisely when I have better measurements to work with.

This time I used the HD58X instead of the HD600, because I think that I managed a more realistic base for further adjustements with the HD58X, I cannot track all headphones at once but need to approximate a realistic response first regardless which headphone, then I can try to.