MSI GT72 DOMINATOR (GTX 970M) - Manual (Page 20)

Introductions
2-10
4. 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.
5. Card Reader
The built-in card reader may support various types of memory card, such as MMC
(Multi-Media Card) and SD4.0 (Secure Digital). Contact the local dealer for further and
correct information and be noted that the supported memory cards may vary without notice.