I use an AVR which is obviously a slightly different way of doing things but the settings should be the same for your soundbar with Dolby Atmos.
Enter the
U9-H's settings --> Sound settings --> Set the following...
DRC Mode --> Line
DTS Drcscale --> SOUND0, (0%, alter if DTS very quiet).
Digital Sounds --> Auto detection, (should auto set to
HDMI passthrough. If it's set to PCM, try manually setting Auto detect or manually set HDMI). Everything should work by HDMI alone & you shouldn't need to connect via additional TOSLINK/Digital coax cables.
Sound Devices --> Input devices - Auto, & Output devices - HDMI.
If you're also using Kodi, depending on your previous hardware & set up you may need to make some adjustments there too.
Enter Kodi's
Settings --> Sytem Settings --> Audio. Most importantly, scroll down to the
Audio Passthrough settings
.
Allow passthrough - Enable. (Then go down the available list, all being well
enable the following)....
Dolby Digital (AC3) capable receiver
Dolby Digital Plus (E-AC3) capable receiver
DTS capable receiver
TrueHD capable receiver
DTS-HD capable receiver
Otherwise, you may also want to
adjust these settings too & you can leave the rest at their defaults...
Output Config - Best match
Keep audio device alive - 1 or 2 mins
Send low volume noise - Enable
You should be all set
. Enjoy.