Straight to the point, I'll be attempting to head into the headphone measuring game. A bit of new territory for me so looking for some additional pointers/advice from the measuring heads here (@Hands, @purr1n, @cskippy, @ultrabike etc. feel free to chime in). Current setup with HD800: Reusing my IEC microphone to mimic the input/transfer impedance of the inner ear per Bruel & Kjaer's researched recommendations. Can't find a ITU-T P.57 compliant ear (or relevant clone) so I've resorted to using the MiniDSP EARS for now. A bit of a placeholder in that regard, at least until I can find something more accurate. Additional purpose is to be portable hence the foldability: Procedures and settings are similar to that of my IEM measurements (also shameless plug to my subreddit where I'm updating measurements/impressions more frequently) though I will be running the headphones off of a iFi Micro iDSD BL for power and SPL reasons. Due to the equipment (literally a phone) and the environment, I'll only be taking frequency response measurements. Also, probably only right-channel measurements due to ear used. FR graphs acquired, processed from raw data gathered by an iPhone 7 Plus on the AudioTools app and subsequently generated with REW: Sennheiser HD600 Sennheiser HD650 Sennheiser HD800 with SDR The data should be closer to that of Innerfidelity's raws, Rinchoi's raws, Stereophile's data, Clarity Fidelity's rig or RTing's stuff. Looks pretty good with the HD650, though the HD800 graph has me scratching my head a little. I'll be heading out tomorrow to get more measurements of other headphones for testing and calibration (feel free to request any) but once all my hardware and settings are finalised, I'll go out full-force with the data collection. Raw data can be provided if needed, just ask.