MSI GT780DXR User Manual page 41

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3. Audio Port Connectors
Make high quality sound blaster with stereo system and Hi-Fi function supported.
Headphone out/ SPDIF-out
Used for speakers or headphones. The S/PDIF connector is also
provided for digital audio transmission to external speakers through
an optical fiber cable.
Connect the Front speakers here.
Microphone
Used for an external microphone.
Connect the Center and Subwoofer speakers here.
Line In
Used for an external audio device.
Connect the Rear speakers here.
Line Out
A connector for speakers.
Connect the Surround speakers here.