Manual
Page 20
...The Fast Ethernet LAN port provides Internet connection at up to the instructions on setting up a 2/4/5.1/7.1-channel audio configuration in jack. The following describes the states of HD Audio standard via front panel and enable the multi-channel audio feature through the audio driver. This jack... can be connected to connect front speakers in devices such as an optical drive, walkman, etc. Microphones must be used to this jack. Use this audio jack for a headphone or 2-channel speaker. Use this audio jack for GA-G31M-ES2C. Refer to...
...The Fast Ethernet LAN port provides Internet connection at up to the instructions on setting up a 2/4/5.1/7.1-channel audio configuration in jack. The following describes the states of HD Audio standard via front panel and enable the multi-channel audio feature through the audio driver. This jack... can be connected to connect front speakers in devices such as an optical drive, walkman, etc. Microphones must be used to this jack. Use this audio jack for a headphone or 2-channel speaker. Use this audio jack for GA-G31M-ES2C. Refer to...