In response to various questions about the WH-1000XM3 in this thread, and in the interests of promoting more discussion, I figured I’d post some quick measurements for them.
First here’s the raw FR plot. This was done with a standard miniDSP EARS unit, using microphone compensation only (no headphone model/compensation), driving the WH-1000XM3 via Bluetooth using AAC and aptX protocols, calibrated to 84 dB @ 300 Hz) and with 1/12 octave smoothing:
And then since questions about how loud they will play have come up a few times, I measured their maximum SPL, again via Bluetooth and using AAC and aptX protocols, at several salient frequencies using a -3 dBFS signal (so measurements could be as much as 3 dB higher than shown depending on your source settings):
The short summary of which is that they’ll play loud enough to damage your hearing even without a full-range signal.