Audio; Hdmi - D-Link DSM-312 User Manual

Section 4 - Configuration

Audio

HDMI

There are 2 options for Audio with an HDMI connection: Passthrough or Stereo.
Passthrough will send the raw undecoded audio from the source. This option is required for 5.1 surround sound (Dolby Digital
Plus).
If your TV does not support Dolby Digital Plus, select Stereo. This will set the audio to 2-channel stereo. Enable if you are having
audio issues with older, incompatible equipment.
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