Gigabyte GA-K8NF-9 User Manual page 80

STEP 3:
Click "Speaker Configuration" then click on the left
selection bar and select "2CH Speaker" to complete
2 channel audio configuration.
4 Channel Audio Setup
STEP 1:
Connect the front channels to "Front Speaker Out",
the rear channels to "Rear Speaker Out".
STEP 2:
Following installation of the audio driver, you'll 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 "4CH Speaker" to complete
4 channel audio configuration.
GA-K8NF-9(rev. 2.2) Motherboard - 80 -
Front Speaker Out
Rear Speaker Out