GIGABYTE GA-8IR2003 - Manual (Page 77)

Technical Reference - 73 -
English
Use the back audio panel to connect the audio
output without any additional module.
STEP 1 :
Connect the front channels to "Line Out", the rear
channels to "Line In", and the Center/Subwoofer
channels to "MIC In".
Basic 6 Channel Analog Audio Output Mode
Line Out
Line In
MIC In
STEP 2 :
After installation of the audio driver, you'll find an
icon on the taskbar's status area. Click the
audio icon "Sound Effect" from the windows tray at
the bottom of the screen.
STEP 3 :
Select "Speaker Configuration", and choose the
"6 channels for 5.1 speakers out put".
Disable "Only SURROUND-KIT" and pess "OK".