Things You'll Need
Instructions
Turn off your PS3 console. Plug one end of the optical audio cable into the port labeled "Digital Out (Optical)" on the back of the PS3.
Connect the other end of the optical audio cable into the "Digital In (Optical)" port on your audio receiver.
Press the power button on the PS3.
Use the left directional button to move to the "Settings" menu.
Press the down directional button to highlight "Sound Settings."
Go to the "Audio Output" sub-menu, highlight "Optical Digital" and press the X button on your controller.
Highlight "Dolby Digital 5.1 ch." from the list of audio formats and press the X button.
Press the right directional button, then the O button, to save the settings and return to the main PS3 menu.