You wrote:
“the usb module of the DP-777 SE is seriously outdated.”
Respectfully, that is bunk. The AMR DP-777se is much more advanced than most dacs out there even today, I bought my 777 in 2011 and I still have it because it sounds flat out awesome, I used to own the best stand alone usb->spdif converter extant (the Sonicweld Diverter, latest version) and it was only the AMR with its custom USB solution that matched the Sonicweld, at least to the point that I decided to sell the Diverter.
I often compare my digital to my extremely high resolution analog systems (tape and two turntable systems)and yes, the analog is better but the AMR is never embarrassed and my AMR CD-77.1 with a double crown 1541 dac chip installed is flat out the finest digital I’ve ever heard regardless of sampling rate and this includes listening to the best DCS has to offer and the MSB diamond dac, I’ve not yet heard the MSB Select dac,
primarily becuase I know their house sound and while it can be very good, I’ve been there done that.