Things You'll Need
Instructions
Turn the Wii off. Connect the yellow cable on your stereo AV cable into the "Video." input on your television.
Connect the white cable into the "Audio Left" input on your 5.1 stereo.
Connect the red cable into the "Audio Right" input on your 5.1 stereo.
Place your stereo into "Pro Logic 2" mode.
Turn the Wii on and wait for the main menu to load.
Select the "Wii System Settings." icon on the bottom left. Select "Sound."
Select the "Surround" option. Select "Confirm." Select "Yes" when asked to confirm the change. Any sound from the Wii should now be coming out of your speakers.