Fiio X3 Complete User's Manual page 13

If OFF is selected, this power-saving feature is disabled and the Idle Standby Timer setting cannot
be changed.
i) Sleep and j) Sleep Timer
If this is turned ON, the player will automatically go into deep sleep after a set amount of time of
playing music with no user operation. Adjust the set amount of time by highlighting the Sleep Timer
option and press Enter to reach a sub-menu where you can choose from 10 minutes to 120 minutes.
After turning this option on and setting a Sleep Timer, a small clock icon will appear in the top
status bar.
Note: The Sleep Timer takes effect only once. After it has been triggered, the Sleep Timer will be
turned off upon turning on the X3 again.
k) Select Output
This option changes the output mode of the 3.5mm bottom-facing headphone jack. Choose
between Line Out (arrow symbol) , Headphone Out (headphone symbol) and Coaxial Out
modes(RCA jack symbol). Line Out mode is used to connect the X3 to external amplifiers, the
Headphone Out mode is suitable for driving headphones, while the Coaxial out mode is used to
connect your equipment's coaxial input by the appropriate coaxial cable.
Music must not be playing at the moment to change this setting.
l) SPDIF out
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,
the coaixal device connecting with the DAP needs to support DSD. It can only support up to DSD64
signal when SPDIF Out, higher specs format like DSD 128 is not supported.
Note: this option only takes effect on Coaxial output.
m) USB mode
The X3 may be set to Storage or DAC mode when connected to the computer via USB. In
Storage mode, the X3 acts as a standard USB storage device; any micro SD card inserted in
the X3 will appear on the computer as a removable drive and you can then drag and drop
e.g. music files into it to add music and otherwise manage your music library on the X3. In
DAC mode, the X3 will act as an external USB sound card and you may play music directly
from your computer through the X3 and enjoy the X3's superior sound quality on your
computer.
Note: driver installation required for DAC mode on windows computers. Storage / DAC mode
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