Howdy everyone, So for the last 5 or 6 years I have been collecting collecting T50RP mods. Before I reduce my collection, I thought it would be a good idea to post my impressions and comparisons of each mod. I decided to take it to the next level and have some fun measuring their frequency response. Therefore, I purchased a MiniDSP EARS to perform the measurements. For dac and amp setup, I chose the Schiit Magni 3 and Modi 3 (delta sigma). Rather than an exotic pairing like Mytek Liberty and Cavalli Liquid Gold, I wanted a setup that could easily be replicated if anyone wanted to compare measurements. The Magni 3 and Modi 3 are very simple and reliable pieces of equipment which I believe are neutral and transparent enough for this application. I plan to measure 19 headphones in the following order: 1. Umodded T50RP mk3 as baseline 2. Dekoni Blue 3. Fostex T60RP 4. ZMF Classics 5. ZMF Virbo mk2 6. Cascadio Audio Talo 2 7. Modhouse Argon mk2 8. ZMF Masterclass V2 9. ZMF Vibro mk1 10. ZMF Blackwood 11. ZMF Ori 12. MrSpeakers Mad Dogs v3.2 13. MrSpeakers Mad Dogs Pro 14. MrSpeakers Alpha Dogs 15. MrSpeakers Alpha Prime 16. Modhouse Argon mk1 17. Surprise 18. Surpirse 19. Modded T50RP mk3 (Vibro Labs TP1 in progress) Yes, the order of these is a little funky. But the idea behind it is I want to measure the unmodded T50RP mk3 as my baseline and compare it to other headphones based on the mk3 driver. I am going to mod them and remeasure as #19. Then measure mods by manufacturer. I will be posting impressions and measurements over the next week or so in the evening (PDT). Later tonight I will post the unmodded T50RP. I will also periodically update measurements on previous post as I get more acquainted with the MiniDSP EARS. Edit/Update: For those interested in my MiniDSP EARS setup. Calibrated the SPL level at 84 db using 300hz sine wave and sens factor of 0.1db. I decided to stick with the MIniDSP HEQ recommended calibration because my unit was not playing well with calibration Marv has tuned.