Noted I've been using oratory and crinacle, that's why I compared in my measurement.
Interesting, with my 'flat plate method' if I EQ'ed the orange curve (no DSP) to lift bass and boost the 1-4kHz region, that would actually align with oratory and crinacle measurements well (the biggest issues anyway - not the micro details)
Even for a pair of headphones like the Sundara I'd be quite careful comparing flat plate measurements with ear simulator measurements at lower frequencies.
The dip at 6kHz shows in everyone's measurement but I don't see them actually applying their EQ and showing the 'after' measurement.
The measurement method you've used may introduce peaks / dips, including nulls resistant to EQ, in places where ear simulator won't feature them, or the headphones on your own head.
Even in ear mics may introduce such features in places where you don't actually experience them if positioned in the wrong place (cf above for example).
Maybe a reason EQ'ing at 6kHz has no effect ?
Some nulls are indeed resistant to EQ (I'll leave it to the acousticians to explain why). Whether you're actually experiencing such null once it's on your head or not is something your measurement method above won't tell you. That said, have you used REW's trace arithmetic feature to evaluate the actual EQ effect ?
Since your main concern seems to be EQing your Sundara, in the absence of in-ear measurements, for a pair of headphones like them (ie generally fairly benign coupling issues), you're better off starting from ear simulator measurements and tweak to taste as @Robbo99999 suggested.
The binaural mics you have can provide very useful additional information regarding what is really happening on your own head with your own sample, and help going further with EQ (I'd argue it's actually mandatory if you want to EQ headphones to tighter tolerances than what ear simulator measurements can achieve), but you won' be able to directly compare the results in absolute terms with ear simulator measurements, you'll need to be careful up to which frequency the mics and method used can be trusted, and notions of target adherence are not straightforward (you can't used ones for measurements at the eardrum with anything but probe tube mics, and even then that is a highly theoretical idea).
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