Rosen R5505 Owner's Manual And Installation Manual page 21

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, since enabling it disables the analog audio output on the
red and white RCA jacks. Note that some digital audio proces-
sors 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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R5505