Just measured this one.
A very graceful friend let me put it on the coupler, to see if what he was suspecting to be "resonance" was right.
And he was right. There is some ringing at 6KHz.
Subjectively, due to the fairly even-steven FR, the headphone is only heard (by me) as a bit thin and occasionally bright. Its tonal balance is actually kinda dark and bassy. With certain kinds of music, it works quite well. If nothing else, at least it's better than the W1000X and W3000ANV IMO.
Worth a look if you're into Audio Technica sound and woody stuffs IMO. Though ringing at 6KHz can potentially be kinda...