Rosen 410X Owner's Manual page 23

Activating the Digital Output
To turn on the digital output, select AUDIO and AUDIO OUT.
Note:
Only enable the digital output when a digital audio processor is
in use. Some digital audio processors will require you to select
an LPCM output frequency.
Selecting an LPCM Output Frequency
To select an LPCM output frequency (when a digital audio
processor is in use), select AUDIO and LPCM OUTPUT.
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