Connection With Other Audio Equipment - Fiio X5 User Manual

Q:Why does the X5 make a clicking sound when turning on / off and when
headphones are inserted / removed?
A:The X5's headphone output goes through a relay to the headphone output.
The relay disengages briefly when the X5 is turning on and off and when
headphones are connected / disconnected from the X5, thus isolating
headphones from potentially dangerous transient pops when the amplifier
section is powered on and off. The relay is a mechanical connection that makes
a small clicking sound when engaging / disengaging.

7)Connection with other audio equipment

Q:How to connect the X5's line out to other audio equipment?
A:The X5's line out outputs an unamplified signal to e.g. amplifiers, receivers,
headphone amplifiers, car audio inputs, etc. The fact that it's an "unamplified
signal" can be misleading however. The line level signal of the X5 is of a higher
voltage than the headphone out at all but the highest volumes and can damage
headphones if you connect them directly to the line out. Please keep the line
out port covered (e.g. using the provided silicone case or port covers) when not
in use to prevent accidental insertion.
Also, some audio equipment (e.g. car audio receivers) cannot handle a high line
input voltage and will distort when connected to the X5's line out. If you find
this to be the case, you may try connecting it to the X5's headphone out
instead and adjust the X5's volume to a suitable level for output to your audio
equipment.
Q:How to connect the X5's "Coax out" to other audio equipment?
A:X5's "Coax out" outputs an S/PDIF compliant coaxial digital audio signal,
and may be connected to decoders, DACs, receivers etc. with S/PDIF coaxial
input ports using regular 75ohm coaxial RCA cables via the provided 3.5mm-RCA
adapter.
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