Things You'll Need
Instructions
Turn off the console, TV and receiver.
Connect the HDMI cable to your console's "HDMI" port, positioned in the middle of the system's backside. Hook the other end into your HDTV's "HDMI" port.
Plug the digital audio cable into your console's "S/PDIF" port to the left of the "HDMI" port. Plug the opposite end into your receiver's "S/PDIF" or "Digital" port. This cable transfers your console's sound to the receiver.
Turn on the console, TV and receiver.
Set your receiver to the "Digital" input. See the receiver's manual if you are unsure how to change the device's input setting.
Set your TV's input to "HDMI." See the TV's manual if you are unsure how to change the device's input setting.
Open the console's "System Settings" menu from the dashboard's "My Xbox" area.
Open "Console Settings."
Choose the "Audio" option.
Choose "Digital Output." Digital audio options appear.
Choose "Dolby Digital 5.1"