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I bought it recently and it's already my most favoured closed back, the alcantara earpads are so comfortable, the weight and clamping force is light, I could wear it all day.
The headband is a little stiff so I bought a fabric cover from geekria for it.
I do a lot of EQ for my headphones, but AutoEQ never worked for me, perhaps the measurement data did not matched to my actual listening, or the headphone did not response to EQ well, they are automatically generated so some may work well and others don't.
The oratory1990 presets work better, most of the time I just make a few adjustments based on his presets.
I use REW to generate the predicted frequence response after EQ, and use sweep wav file (20hz~20khz) from churchsoundcheck to confirm the frequence response is flat and smooth enough (gui frequence analyzer is needed to find where the dip and peak at, they may different to measurement data).
For SRH1540 I had to dump the new measurement data from oratory1990's pdf (the old data on AutoEQ repository is not accurate), AutoEQ contains a tool to generate frequence response based on pdf file, it's really useful.
After few hours I did make it really flat:
View attachment 145580
The targat is oratory1990 optimum hifi target and I bring up a little bass for my preference.
Sadly, after several hours of testing, I decide to only keep the first 2 filters that bring the bass down, because the mid and the treble are already close to the target, leave those dip and peaks will make the sound more "enjyoable" to me.
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I also have a linux environment, for SRH1540 I set the parameters to RME ADI-2 because 2 bands are enough, but for other headphones I use ladspa with EqFA12p plugin to set the global equalization. (see
https://www.bitlab.nl/page_id=540)
The EqFA12p plugin require 1/2 bandwith instead of Q, the correct formula should be "bw = ln(1 + 1/(2*Q^2) + sqrt(((2*Q^2 + 1) / Q^2 )^2 / 4 - 1)) / ln(2) / 2".