Instructions
Turn on the PlayStation 3 Slim console. The main screen appears.
Scroll to the "Settings" icon using the directional pad or left analog stick. A vertical menu appears.
Choose the "Video Settings" icon, and press "X" to proceed to the next menu. Two options appear: "BD Audio Output Format (Optical Digital)" and "BD Audio Output Format (HDMI)."
Press "X" on the "BD Audio Output Format (Optical Digital)" icon. A small menu appears. Select "Bitstream (Mix)" and press "X." Press the "O" button to return to the previous menu.
Repeat Step 4 to select "BD Audio Output Format (HDMI)." Select "Bitstream" from the next menu. Your PS3 Slim is now set for bitstreaming.