[willis936]

The ODAC is soldered to the O2. The O2 is in pristine condition (and I did splurge for an OP2227 in the voltage gain stage and WIMA caps). The analog in works on the O2 so I may abandon the ODAC in place.

The Fiio options do look good. My current desktop application has me switching headphone and mic between a work laptop and personal desktop and headphone and speakers often. I use analog switches, but I'm leaning towards a one box solution in the future rather than adding more hardware. So something like a mayflower ARC mk2 perfectly covers all of my demands (including a bass boost option for my open-back headphones). I already use a USB switch with a powered USB hub, so really it would be swapping out 3 boxes and many cables for one box. The schiit hel 2 looks really great but I've read reports of 200 ms latency.