Intel NUC 815BEH running ROCK with 16GB - 2TB SSD storage
Gigabit switch wired connection with ASUS RT-AC5300 running ASUSWRT Merlin on a 1GB wired fiber connection
Sonos ARC via HDMI with 2 Sonos Fives and 2 Sonos Subwoofers in surround mode using a Vertex2 from HDMI fury for switching between AppleTV and ROCK NUC
I am not getting any sound from the surround channels when playing stereo files with the Channel layout set to 7.1, 5.1, or 2.0. The subwoofers appear to be active. I’ve tried “Downmix as needed” and “Channel Mapping only”, and swapping rear/surround channels.
If I play a 7.1 (or 5.1) channel FLAC file, I get discrete sound from the rear channels with 7.1 (or 5.1) Channel layout in settings.
If I use Airplay instead of HDMI for Stereo files, I get good sound from the rear channels, just not discrete. Obviously, this must be a SONOS feature as it works with music this way when playing anything Stereo thru Sonos.
Please help me get some sound from my surrounds.