Avayon DXP-7P - Manual (Page 29)

Setting Audio Output
1. Press SETUP on the remote control.
2. Use the direction keys (▲▼◄► ) to select Audio Setup and its
sub-menu.
3. Press ENTER or SETUP to confirm and exit.
Changing AUDIO output
Note:
SPDIF/OFF: select this when you do not want to have digital
audio signal output.
SPDIF/RAW: select this when the digital audio output is
connected to an external amplifier with Dolby
Digital or DTS decoder which gives 5.1 channel sound.
SPDIF/PCM: select this when the external amplifier has no decoder.