I upgraded my Sennheiser 598's to Oppo PM-3's. I had been using both with my Schiit Modi 2 Uber, and found my PM-3's took the largest advantage there, as they are natively more accurate, faster, and full-bodied as a transducer. They were much more capable of transforming the more accurate signal into a huge improvement in SQ. I had begun to let my 598's to gather dust. Enter the Schiit Vali 2. It drives both of these easily driven cans with absolute authority, but we're not here to talk about something as simple as watts/ohms. I admit I drove my...