Asus Xonar HDAV1.3 - Manual (Page 71)

65 ASUS Xonar HDAV .3
Dolby Virtual Speaker (Virtualized 5.1 surround sounds over stereo speakers)
.
Open TotalMedia Theatre > Setup > Audio.
2. Select 5.1 Channels in Audio Output Mode.
3. Press Apply first, and then press OK.
4. Open the Xonar HDAV Center.
5. Select 6 Channels in Audio Channel.
6. Select 2 Speakers in Analog Out.
7. Check Dolby Virtual Speaker.