Sony VGC-LV170J - Manual (Page 187)

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Troubleshooting
How do I output the Dolby Digital or DTS sound through an S/PDIF-compatible device?
To output the Dolby Digital or DTS sound from a disc through an S/PDIF-compatible device connected to your computer,
follow these steps:
1 Click Start and Control Panel.
2 Click Hardware and Sound.
3 Click Manage audio devices under Sound.
4 On the Playback tab, select the optical out icon and click Properties.
5 Click the Supported Formats tab.
6 Click to select the DTS Audio and Dolby Digital check boxes.
7 Click OK.
!
If the Dolby Digital or DTS output is connected to a device that does not support it, the device will not play any sound. In such a case, cancel the DTS
Audio and Dolby Digital check boxes.