Asus Xonar U7 User Manual page 43

(4). If you are using Dolby Digital Live encoder through the S/PDIF output, the
analog output will be muted to get rid of the interference between your digital
speaker system and analog speakers or headphones. Please check if this is
the case.
(5). Please go to the sound and audio device of Windows
whether the playback default device is set to Xonar U7 Audio Device, instead
of other onboard AC97 or HDA codec device. If it's not, please set it to Xonar
U7 Audio Device and restart your applications.
(6). Restart your computer.
4. I can't hear any sound from the S/PDIF output
(1). Ensure that you have enabled S/PDIF output in the Audio Center GUI (Main
page).
(2). Ensure that you have connected the correct S/PDIF output jack in the card to
the decoder's (AV receiver) S/PDIF input jack.
(3). You may need to select the correct input and mode of your decoder or AV
receiver. For Dolby Digital or DTS output, double check that the AV receiver
is in that decoding mode.
(4). If you are using 192KHz PCM output, make sure that your decoder can
support 192KHz decoding. Try changing it to 44.1K or 48KHz first.
ASUS Xonar U7 User Manual
Control Panel to check
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