DGTEC DG-FV5800 User Manual page 12

Connecting you STB
How do I connect to an external audio device?
Connect the AUDIO R/L socket of the STB to the Audio System e.g. HI-FI, Amplifier, etc.
Alternatively an optical cable can be used from the rear S/PDIF to a surround sound
system. This offers the user the best possible audio quality, only if program being viewed
is broadcast in a recognisable audio format.
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