Fiio X7 Mark II User Manual page 19

d) Audio settings—Multifunctional Output
The 3.5mm output port at the up left of the X7 may output analog line signal or coaxial/optical
digital signals. This menu item lets you choose among the three.
e) Audio settings— SPDIF out setting
There are two modes of using the SPDIF Out: D2P (DSD to PCM) and DOP (DSD over PCM).
Under D2P mode, you play the PCM signal and will get the original PCM signal out. When playing
the DSD signal, system will convert the DSD signal to PCM signal and output. Under DoP mode,
PCM signal can be directly outputted and so does DSD signal. However, to have the signal output,
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