@DavidA - very nice setup. Thank you for sharing your comparison. I often find myself using the HD650 just for the fit and comfort.
Overall, IMHO, the Nhoords are superior. I recently purchased some wood 3D printer filament, and have a couple of sets of RS1 style cups printed. I am planning on trying them in one set. It will be intrresting to see if the sound changes. Right now, they live in maple GS1 style cups. The printed cups feel like bamboo.
Speaking of printed cups, does anyone have a model for the GH1 cups? If not, with some measurements, I can model them. My GH1 sold long ago, regretfully.