Phantom 5.5 / 7.7 Immersive Theatre System

[Cyral]

Don't think it's possible to use Jriver with an Apple TV 4K. However, I did read that you could use Jriver with airplay from a different ios device to the Apple 4K tv, but think that's a compromise in sound quality. 

I use Jriver with a htpc and the results are great. A lot better than using a regular blu ray player.

Nice. How do you connect HTPC with the Phantoms?

With an optical cable from the HTPC to one of the Phantoms.