Asus D2X - Manual (Page 11)

5 ASUS Xonar D2X
2. About Hardware
2.1 Xonar D2X Audio Processing Card
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MIC In Red
Line In
Front Out
Side Surround
Center & Subwoofer
Back Surround
SPDIF In
SPDIF Out
Blue
Green
Orange
White
Amber
No LED
No LED
LED color definition