Asus Xonar HDAV1.3 - Manual (Page 66)

60 ASUS Xonar HDAV .3
6.12 DVD/Blu-ray playback over DH/DVS/DDL/Multiple
Analog Speakers
6.12.1 Under Windows XP
Dolby Headphone (Viertualized 5.1 surround sounds over stereo headphone)
.
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 Headphone in Analog Out.
6. Check Dolby Headphone.