Here is my setup;
AMD HD5770 HDMI Out to;
Pioneer VSX-518-K AV/R
Pioneer VSX518 Out to 5.1 speaker configuration
Windows 10 Pro
My Pioneer has auto input detection and here are my various scenarios;
1. Windows 10 configure speaker setup as "stereo"
Windows 10 outputs two channel stereo via HDMI to my AV/R. AV/R shows Dolby Digital input and outputs sound to all 5.1 channels regardless of source i.e. Netflix (via browser), Amazon video (via browser) or any other streaming type website. It also does the same if I'm playing back movies from my movie library. But my gut feel is that the surround is simulated and not true since the source is only two channel. Anyone know if that is a correct assumption?
2. Windows 10 configure speaker setup as "5.1"
Windows 10 outputs 2.0 or 5.1 audio via HDMI to my AV/R dependent on the original source material. If the source is 2.0 then the playback is 2.0. If the source is 5.1 then the playback is 5.1. The strange thing in this configuration my AV/R detects input as PCM regardless of the source. If I use the Windows 10 Netflix app, I get 5.1 channel playback if the source material has 5.1 or higher audio tracks. If I use a browser for playback I only get stereo - my guess is that Netflix via browser doesn't support HTML 5 or Silverlight. All Amazon video only plays back in two channel if I've got the speakers configured as 5.1. That is probably an Amazon video thing and might not have anything to do with the OS or hardware.
3. When playing bluray I use PowerDVD and have it configured to passthrough audio directly to the AV/R. This results in my Pioneer AV/R detecting DTS or Dolby Digital depending on the source and passing the audio onto my speakers without interference. Playback sounds perfect.
So for all you running HTPCs and Windows 10, how is your speaker setup configured in Windows 10? Are you set to 2.0 Stereo or 5.1? Does any of your gear exhibit the same behavior as mine or am I on a boat all alone?
IYHO what is the correct speaker setup configuration in Windows 10 when using an AV/R to decode and transmit the audio to your multi-channel speaker setup?