Dive into the rabbit hole executed.
ETA for arrival of Gumby with gen 5 USB is Monday. Also expecting arrival of Jotunheim next week to complement Modi 2U / Magni 3 stack.
Will be using them ( and shuffling around ) with an ancient Sony DVP-S7000 transport, iMacPro, U-Turn record player, into mixture of Paradigm speakers (Reference Studio 100, Active 40 ) with Parasound HCA-1500 and Denon 7200W for amplification. I made my own cables from Canare/Neutrik components - being a ham radio, soldering iron never leaves my sight

. Music is mix of 70-80-90 rock, jazz, plenty of classical with forays into anything loud. Cans are of entry level type - Sony MDR 7506 ( which I love for sound and hate for getting my ears hot during long radio sessions on the air - even with velour skins ) and Grado.
Skimmed/read parts of this thread. Thanks for lot of advice and interesting tidbits !