AMD GA-K8N51GMF - Manual (Page 81)

Appendix - 81 -
English
6 Channel Audio Setup
STEP 1 :
Connect the front channels to "Front Speaker Out",
the rear channels to "Rear Speaker Out", and the
Center/Subwoofer channels to "Center/Subwoofer
Speaker Out".
STEP 2 :
Following installation of the audio driver, you find a
Sound Effect icon on the lower right hand taskbar.
Click the icon to select the function.
STEP 3:
Click "Speaker Configuration" then click on the
left selection bar and select "6CH Speaker" to
complete 6 channel audio configuration.
Front Speaker Out
Rear Speaker Out
Center/Subwoofer
Speaker Out