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• Please make sure the tubes is completely pushed into the
socket, incompletely connection will cause this issue.
• Please reconnect the power adapter to the BOX X4 to try
again.
Note:
• If the noise still, please contact us via email at
• BOX X4 is a preamplifier, not a power amplifier, cannot be
connected with passive speakers directly.
2. All cables are connected, but there is no audio
output?
• Please check if your audio source, BOX X4, amplifier or
powered speakers all are turned on and in working mode.
• Please check whether the light of the vacuum tube is always
on after power on, check whether there is a problem with the
vacuum tube.
• Please check if the music in your audio source is paused.
• Please make sure that you are chose the correct input mode
of the BOX X4, if the 3.5mm AUX input plug in, the MM input
mode will be interrupted, at this time if you want to use the
MM input, you need to disconnect the 3.5mm AUX input first.
• If the connection is right but the BOX X4 does not work,
please try another power supply (Any DC12V power adapter
can work with BOX X4, you can use the power adapter of
WIFI router or camera) that is suitable for the BOX X4.
If BOX X4 works after replacing the appropriate power
adapter,it means that the power adapter is probably broken,
please contact us to replace the power adapter; if BOX X4
still not works after replacing the appropriate power adapter,
it means that the BOX X4 is probably broken, please contact
us to replace the BOX X4.
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