Marantz NA6005 Owner's Manual

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Connecting to a device with digital audio input connectors
Use this connection to output digital audio signals from this unit, and convert the signals for playback using the D/A converter of a connected device.
.
OPTICAL
IN
AV receiver / 
D/A converter
Use the Digital Out button to set the digital audio output on or off.  (v p. 37)
Signals with a sampling frequency of 32 kHz and DSD signals cannot be output from the Digital Audio Out connector of this unit.
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