A:Answer Does your receiver have any HDMI ports? The X800 has two HDMI outputs, one for both video and audio and one for audio only. The HDMI audio only is intended for older receivers with HDMI that do not support 4K, but can be used for Dolby or DTS audio processing. It might be time to upgrade your receiver. Does your receiver have HDMI that supports ARC (Audio Return Channel)? If so, connect an HDMI cable from the TV's HDMI (ARC) port to the receiver's HDMI (ARC) port and use that instead of an optical connection. Make sure HDMI-CEC is enabled on the TV, receiver, and X800. The receiver will recognize the ARC connection and go into a 'TV' mode for processing the audio from all sources connected to the TV. That will be a better solution than an optical cable.