re: Who to Call .... Dolby Atmos Samsung-Denon

You have a 5.1.2 set up which is a better format than 7.1.

Using ceiling speakers is just fine for rear surround.

The two behind or closest to the listening position in the ceiling will be the surround , two closest to the TV will be the height/Atmos speakers

You will need HDMI

You will set Auydessy amp selection/speaker configuration to 5.1 + Atmos front height giving you a 5.1.2 atmos enabled system.

Consult manual for proper speaker wiring location on back of AVR

All of your speakers will be set to “small” this is because you have a subwoofer. No sub, set to large.

After running the Auydessy room correction, set all speakers to small and Front/center and surround crossovers to 80hz, Atmos to 120hz

For the subwoofer, you want to set the subwoofer volume (on the sub itself) so that when running a test it automatically sets the sub at -11 or greater. If you see -12 the sub is set too loud and you need to lower and run again. When you see it at -11 or -10 etc, your sub is correct and proceed to start speaker sweep.

When completely done, add +2 - +4 on the subwoofer level in the manual speaker setting menu on the AVR (not physical subwoofer)

This will give you a solid starting point that you can then adjust to your liking.

Let me know if you have any questions