MSI 845PE Max Manual page 86

MS-6580 ATX Mainboard
Connecting the Speakers
When you have set the Multi-Channel Audio Function mode properly
in the software utility, connect your speakers to the correct phonejacks
in accordance with the setting in software utility.
2-Channel Mode for Stereo-Speaker Output
When this mode is selected, it is recommended to attach the
speakers to the Line Out connector on the back panel instead of the
Line Out connector on the S-Bracket.
Refer to the following diagram and caption for the function of each
phonejack on the back panel when 2-Channel mode is selected.
Select "Default Phonejack"
1 Line Out (Front channels)
2 Line In
3 MIC
1
A-6
Deselect "Default Phonejack"
1 Line Out (Front channels)
2 Line In
3 MIC
Back Panel
2
3