"Arfa Daily" wrote ...
"Chronic Philharmonic" wrote ...
The sending device might be coding the datastream as a mono feed, or the
receiving device is failing to decode the datastream as a stereo feed. It
might be something as simple as a configuration problem (one of the
devices is set to 'mono'). To diagnose a fault, use a protocol analyzer,
or a process of elimination by substituting components until you get
something that works.

Even if it were, that would not result in the loss of one physical
channel's reproduction from the amp. What you would have is both left and
right channels combined into one single mono channel, which would then be
identically coded onto both left and right channels, within the single
SP/dif data stream. So you would get two channels physically reproduced,
but each containing the same mono audio.

But only a fantasy academic discussion as there is no monaural mode
defined for SPDIF.