I did this with a 1st gen Apple TV with OSX on it. Used the program Pure Music to output stereo as mono and used a cheap USB to SPDIF converter (NuForce U192s) to connect to the DSP5000C.

It worked fine, but I discovered the 5000C is still a really big and heavy speaker, so there weren't to many places I could stash it that fit with the room (my wife noticed a big ugly speaker box every time). It wouldn't even fit on my shelves as it was too deep. Plus, it's weight prevents any dream of portability.

Living Room: TV-->Sonos Arc with Symfonisk rears and twin Sonos subs. Also, a set of DSP8000SE with a MiniDSP SHD for stereo listening.
Listening Room 1: G65, DSP7000SE, DSP3300, DSP3200
Roon Core: NUC7i7