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Troubleshooting/QA
1. Get noise/humming when turn the BOX X4 on?
• Please know that when no inputs connected to BOX X4, the
default input way is MM input mode, in this mode, the gain of
the amplify is much large then other input modes, so it’s
normal that will have some humming sound when no sound
pass through.
• Please unplug all the inputs from the BOX X4, then turn it on
to check if the noise still or not.
• If the noise disappear, the noise may from the audio source
or audio cable, please exchange the audio source and the
audio cable to try again.
• If the noise still, the noise may from BOX X4 or amplifier/
speakers:
• Please exchange the audio cables and amplifier (powered
speakers) to have a try and make sure that the noise is from
which devices.
• Please volume down the “Treble” volume on the BOX X4 to
check if the noise volume follows or not.
• Please make sure all the cables completely pushed into the
device, incompletely connection will cause this issue.
• Please make sure that your turntable is MM output
and also make sure that it is phono output, some
turntables built-in phono preamplifier, so it should
connect the 3.5mm AUX input on the BOX X4 not the
phono input. Also make sure the grounding wire is
connected well with the BOX X4, please reconnect it
to have a try.
• Please keep this device away from other electronic devices,
like the FM radio or WIFI router.
Note: Once 3.5mm AUX plug in, the MM input will
automatically interrupted, so the input mode
will turn to 3.5mm AUX input.
Input priority: 3.5MM AUX input > MM turntable
input.
Step 4 : Connect the power adapter to BOX X4 and the
socket. Turn the Multi-function Knob (Volume
Control/Power Switch) clockwise to power on the
BOX X4.
Note 1: The power adapter does not have a power indicator
light, so connecting to the socket means power is
on.
Note 2: Before connecting the power supply, please make
sure that the BOX X4 is in “OFF” position when
connecting to the power adapter. Otherwise there is
a “POP” click sound from your speakers.
Note 3: Before connecting the power supply, please turn
down the volume control, the bass and treble control
to 0 (always to the left) to avoid your hearing from
damage.
When the connection is completed, please turn on the BOX X4
first, then turn on the amplifier (or powered speakers), at last
turn on your turntable or other audio source, then enjoy.
Note: If you turn on the amplifier (or powered
speakers) first, then turn on the BOX X4, there
is a “POP” click sound from your speakers, it is
normal that all the phono preamp have the
same issues, please don’t worry about it, the
“POP” click sound will not damage your
amplifiers or speakers.
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