Just so I can be a ridiculous royal class butthead as I said I would: I hooked Koss ESP950 with Vesper Audio pads <-- iFi Audio iESL <-- x2 Tyr WOW. This was an unexpected treat. I felt moderately satisfied with either Vidar or Aegir into this iESL -> Koss. However, with the Tyr in the loop, I felt extremely satisfied, very happy. Never had I heard the Koss ESP950 sounded so good, so powerful, so resolving, other than from the DIY T2. (Sorry STAX fans, I prefer the ESP950 over any Lambda). @zerodeefex: I think you would be super happy with x2 Tyr to replace x2 Aegir with your RAAL SR1a set up. I plan on making this my electrostatic headphone setup with x2 Tyrs for Microsoft Teams, Google Meet, and Zoom for work. We can have our video meetings this way for the highest sound fidelity possible - just because we can.