MSI MS-6580 Manual page 88

Digital Audio Output
When any Multi-Channel Audio Function mode is selected, you may
also connect your speakers to the Optical or Coaxial SPDIF phone
jack on the S-Bracket to exprience digital surround sound effect.
Remove the plug from the optical SPIDF phone jack before inserting
the fiber-optic cable, and read the following diagram and captions
for the function of each phone jack on the S-Bracket.
1 Optical SPDIF jack
2 Coaxial SPDIF jack
1
Using 4- or 6-Channel Audio Function
S-Bracket
2
A-11