Jriver MediaCenter21 -> Schiit Bifrost Multibit w/2nd Gen USB -> Kenwood M2A Power Amp w/headphone jack OR Bellari HA540 Pure Class A Hybrid Headphone Amp upgraded with Early 60's Siemens Munchen 12AX7  -> Alpha Dog OR Sony MDR-MA900 (Also Senn RS-180 Wireless for casual listening)