MSI GS70 User Manual page 19

6. 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/ Line In:
Used for an external microphone.
Connect the Center and Subwoofer
speakers here.
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