MSI GS70 STEALTH PRO - Manual (Page 19)

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