Nubert X3000 to Neumann KH80 transformer EQ (Patreon)

Sorry about that, but yeah the X3000 are way too bright in reality especially at nearfield. I was quite shocked when I tried the KH80 today which are way darker, therefore I will definitely need to readjust my target and get a way more precise approximation. 

I did some very quick measurements of both speakers outside and created a simple correction filter-set based on these measurements, X3000 in blue, KH80 in red:

If you apply these on top of my recent EQs, you should get a better resemblance of "neutral" than what I achieved with the X3000 until now. Keep in mind this is just a rough approximation based on the delta between both speakers above 1khz, thus I tried to correct for the errors in frequency response of the X3000 in regard to the KH80 which as you can see from the measurement is not flat either above 3khz. 

Here the resulting new response of the HD58X compared to before, which should also sound more "normal" and closer to neutral:

But I will need to do some more precise measurements next time to equalize the KH80 as good as possible to flat at my listening position and then do all my listening again based on this new setup. I am glad to have the next week full of time to able to concentrate on this. I will try several placements and different rooms to check were I will get the cleanest response above 1khz. I don't care that much below 1khz, as this should remain mostly flat anyhow. But I will try to get a more exact representation of neutral this time, which should be easier to judge with a graph as flat as possible, because there are definitely some deviations below 1khz as well what the ear perceives compared to a measuring microphone.

This is the only I can offer as for until I have better data to work with, so stay tuned!