Asus Xonar U1 - Manual (Page 6)

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6 Xonar U1 Quick installation guide
For Digital Speakers
SPDIF Out
Plug the optical TOSLINK adapter into the S/PDIF-Out port. Then, connect your
decoder’s S/PDIF In port to the optical adapter with a TOSLINK optical cable.
The TOSLINK optical cable is purchased separately.
Connecting headphone / microphone
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