Study rig: various transports but mostly Mac Pro/iTunes/BitPerfect->Schiit Bifrost Multibit, Yamaha DVD750 (for SACD).
HT: Oppo BDP-83, Apple TV (4th Gen), Fire TV Stick
Mobile: iPhone 6, iPad Air 2, TEAC HA-P50
Coat hangers. OK, not really, but it's all just copper wire, man.
To quote the Schiit Ragnarok user manual: "You can also use fancy audiophile types, but they won’t really do anything—what about the thousands of feet of crap copper cables in your walls, huh?"
Other Audio Equipment:
HT setup is Denon 3808 into PSB Image 4T, 8C, S50, SubSonic 5. Running Yamaha A-S500 into Ascend Acoustics Sierra-1 NRTs in my study. The Sierras are amazing.
Rock, classical, electronica, 80s europop
iToys, my MazdaSpeed3
From Michigan, Minnesota, California, Georgia, Pennsylvania, Texas...
Ultramobile rig: iPhone 7 -> dongle -> MX760 or Yuin PK2 or KSC-75 or MX685 or ATH-ES7 Mobile rig: iPad Air 2 -> TEAC HA-P50 -> ATH-MSR7 Air travel rig: iPad Air 2 -> TEAC HA-P50 -> ATH-ANC9 Stationary rig: Mac Pro -> TOSLink -> Bifrost Multibit -> Magni 2 Uber -> ATH-R70x or AKG K553 Pro