Phil's EARS SBAF compensation Left txt Phil's EARS SBAF compensation Right txt Koss Porta Pro mdat Senn 6XXm uncompensated mdat Senn 6XXm SBAF compensated mdat To compare 6XXm drivers switched vs originals I think they would need to be signal level matched? So, that would require redoing the measurements that way they are all done at once with the same settings on my amp and hopefully better consistency in positioning. "Measurements are hard" and time consuming. My comp's levels need to be slightly adjusted and between 3-5k needs an extra touch? I've shared my EARS' SBAF compensation files and REW mdat files just incase any kind and proficient participant would be interested in lending a hand. FYI I'm not Excellent. My wife actually helped me do my original SBAF HEQ txt, and I think it partly failed due to my poor instructions. Luckily, Lyander and Biodegraded offered their assistance. Some iem and earbuds measurements to come for more data. And I would lend a Hemp to @purr1n for review and for calibration reference. ?