Now that we're starting to catch up, here is the often requested frequency response. This is not an average, it is not smoothed, and it's a single point measurement (vs an average of multiple passes for one phone) for our master reference headphone. We tune our phones to be within +/-2dB of this curve.
As usual, the rolloff that starts at about 1.5K is characteristic of our headphone measurement system, and actually this represents linear. What's going on in the plot above 5K is very random based on micro adjustments of the phone on the test fixture.
I always hesitate to put plots out as many people expect headphone measurements to look like ruler flat speaker plots, but the reality is above 1.5K peaks and troughs are part of "flat" measurements.
Hey Dan, is there any form of compensation applied to the measurement here?
Regardless, the pattern definitely looks very similar to other MD measurements, except in this case the midrange with AD seems much more in-line with the rest of the FR (MD's midrange had a bit of a hill around 800 Hz with purrin's measurements), and overall sweeping balance seems better, though to really see we'd need side-by-side comparison either all with your measurements or another sources.
Indeed they are. I can't quite match the graphs but they look quite similar. Yay variations in measuring headphones!