MSI 990FXA GAMING Mode D'emploi page 19

▶ Audio Ports
These connectors are used for audio devices.
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Line in: Used for connecting external audio outputting devices.
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Line out: Used as a connector for speakers or headphone.
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Mic: Used as a connector for a microphone.
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RS-Out: Rear surround sound line out in 4/ 5.1/ 7.1 channel mode.
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CS-Out: Center/ subwoofer line out in 5.1/ 7.1 channel mode.
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SS-Out: Side surround sound line out in 7.1 channel mode.
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