Just wanted to share these T50RP measurements:
Thanks for sharing... let me share something with you
I measured the same 'chunk' and am annoyed with the lack of highs extension.
15dB down around 3.5kHz !
They drop off quickly above 10kHz and at 20kHz they are already 20dB down !
Indeed it is what makes them sound 'weird' when compared to 'flatter' headphones.
The lack of highs extension is what bothers me most when compared to others.
Purple is stock T50RP (not entirely stock it has the familiar mechanical mods) NO fake Pinna.
Blue is what it can be (but not through mechanical mods)
When you measure the same headphone with the BMF kit you will find the dip around 3.5kHz is gone.
I think it is because the mic is closer to the driver and the Pinna alters the FR.
The chunk gets smaller if you use a fake Pinna around the microphone as well (I made one of malleable eraser).
When sweeping it with a tone you will find that the 'dip' isn't 15dB but smaller (about what it measures with a fake Pinna)
The dip seems really there and when compensated as the blue line it sounds incredible, nothing like a T50RP
It is my go-to headphone (the blue lined one)
B.T.W.
I REALLY dig the comparative plots you often make, with 'well known' headphones, it shows in a more direct way what to expect.