Instructions
Connect your PS3 to your television via HDMI cable. Plug one end of the cable into the HDMI port on your PS3, and then plug the opposite end of the cable into the PS3 port on the television.
Plug the PX21's USB cable into the USB port on the front on your PS3. Plug the PS3 end of your PS3's audio/video cable into the "AV Multi Out" port on the back of your PS3. Plug the red and white connectors, on the opposite end of the cable, into the red and white ports on the PX21's splitter cable.
Plug the red and white ends of the PX21's splitter cable into the red and white "Audio/Video In" ports on your television. Plug the PX21's green plug into the splitter cable's green connector. Power on your PS3 and television.
Select the "Settings" option from the PS3's main menu. Select the "Sound Settings" option in the Settings menu, and select the "Audio Multi-Output" option to finish setting up your PX21.