Asus Xonar DX - Manual (Page 14)

ASUS Xonar DX
3.3 Connecting TV Tuner Card
1.
If you have a traditional PCI or PCI Express TV tuner card on your PC, you
may need to connect it to the audio card to send the tuner card’s sound to
your PC speakers.
2. Secure the PCI/PCI Express TV tuner card and screw it into the back-panel.
3. Connect the audio output header from the TV tuner card to the Aux-In header
of the audio card, as shown in the figure below.
For optimum TV audio quality, Xonar uses ADC recording to digitize the signal
and loops it back to DAC playback. Please select Aux-In as the recording
source in the Xonar Audio Center’s recording mixer and enable the monitoring
button to pass this signal to the audio output. Using this setup, you can even
turn on sound effects such as Pro-Logic IIx to expand the stereo TV audio to 5.
or 7. channel surround sound. TV audio on your PC will become even better
than on your TV set!