Question about Sony HT-S40R

Yes, you can operate the soundbar via your Denon AVR-X2800H by using the optical audio input or HDMI ARC. The Denon AVR-X2800H has multiple HDMI inputs and outputs as well as eARC, which enables connection to compatible devices such as the soundbar The soundbar supports Dolby Digital and LPCM via these connections.

Thank you