Just updating this with additional measurements of the HEDDphone. This was a very difficult one to measure because the cups are so large they don’t always sit on the rig the way they sit on your head when you wear them. With that said, this was the most consistent result, and it should reflect the most common placement.
And here is HEDDphone vs HiFiMAN Arya:
One thing to note, that weirdness in the mids on the HEDDphone showed up on most measurements, but when I positioned it as far forward and upward as I could it tended to go away. For some positions, I find the unevenness isn’t as audible as the averaged measurement of all positions shows here.
Here’s my video comparison of these two:
