GIGABYTE GA-8I845GVM775 - Manual (Page 63)

Appendix - 63 -
English
STEP 1 :
Insert the "Audio Combo Kit" in the back of the
case,and fix it with the screw.
Advanced 6 Channel Analog Audio Output Mode (using Audio Combo Kit,Optional Device):
(Audio Combo Kit provides SPDIF output port : optical & coaxis and SURROUND-KIT : Rear R/L &
Center/subwoofer)
SURROUND-KIT access analog output to rear
channels and Center/Subwoofer channels. It is the
best solution if you need 6 channel output, Line In
and MIC at the same time. "SURROUND-KIT" is
included in the GIGABYTE unique "Audio Combo
Kit" as picture.
STEP 2 :
Connect the "SURROUND-KIT" to SUR_CEN on
the M/B.