I dont pay much attention to graphs given the unreliability of measurement methods and rigs. What really stand out to me is really the resolution and details of a set of cans.Honestly i really dont mind a more into my face tuning or a neutral, boring as long as they are distortion free. I agree, everyone looks for something different but certain basic qualities in headphones should be preserved, regardless of tuning.
I love the Nano, the Aryas, the hd600/650 etc but the sound should be clean up to 120dB to have the margin of a freedom to EQ, listen louder etc.
Apart from that, looking at the NDH30 measurements, it still seems to be quite off at 1,5-3k (like Hifimans) and too exaggerated at 3,8k. Actually the hd650 measure better in this area so maybe your impression of the hd650 being better wasnt too far off
I guess that's why I'm very curious about electrostatics. I tried a set of CRBN and was very impressed but I never tried a set of Stax. Might be paradise for me...who knows.
Just a friendly reminder that listening to headphones at 95db spl for more then 50 minutes would result in permanent damage to your hearing. Not to point out that 120 db spl would probably be instant damage.
EDIT:
Hearing damage exposition limit
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