Subjective impressions here: http://www.superbestaudiofriends.org/index.php?threads/stax-sr-202-srm-212-loaner-impressions.3612/ This will go back to @sorrodje tomorrow and I wanted to get the measurements out before I I ship it away. Compare to Marvey's SR-207 measurements: http://www.superbestaudiofriends.or...170-sr-207-earphone-system-measurements.3595/ My measurement rig is detailed here: http://www.superbestaudiofriends.or...nt-setups-post-your-rig.141/page-7#post-50142 Frequency response (coupler): As expected the coupler doesn't seal with the earpads, but that's not the point for this measurement. In terms of seal the in-ear measurements are much more accurate anyway. With this measurement we already get a hint at the 1.5kHz bump and treble ringing. BTW: Fantastic driver matching. CSD (35db range, right channel): A resonance around 8kHz. Tiny ridges around 3, 3.4 and 4.2kHz. The left channel didn't look too different. Those tiny ridges don't look bad, but they always seem to be there with the STAX. There are actually a lot more when you drop the noise floor. This seems to be mainly what limits estats from getting as clean CSDs as something like the HD800. I think part of this is the driver itself and part of it could be reflections from the grille on the outside. No coupler measurement: This is with the mic just infront of the driver, about where the earpad ends. Maybe 1cm distance to the driver: Fs L is about 196Hz, Fs R is about 199Hz. The difference is slight, but noticeable when blowing on the driver. The overall FR tendencies stay the same versus the coupler measurement. Ear canal opening mic measurements: This is about as good a seal as I can get on my head. I wear glasses, but the glasses didn't seem to influence the result at all. I can only get flat to 20Hz with some pressure. The general FR now becomes too tilted upwards after 1kHz. As I said in the SR-207 thread I like to EQ everything above 1kHz down by about 4db. The 9kHz spot actually sounds worse than it looks, probably because of the huge dip just below it. Distortion at 95db, 500Hz (Left channel): Note that I get a lot of 50Hz + multiples hum which shows up in the distortion results. This is also why I limited it to 30Hz, instead of 20Hz. There's a huge 25Hz 2nd order spike (you can see it rising already) because of the hum. Using the harmonic frequency as reference, which is why I get a lot of peaks after 2kHz. That's just the SNR varying with the FR. Distortion should stay similar above 2kHz. I generally get slightly more 2nd order distortion than the HD800. Distortion is low but not incredibly so.