Fosi Audio BOX X4 User Manual

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Step 1: Install the 5654W vacuum tubes to the BOX X4.

Step 2 (OUTPUT) : Connect speakers or headphone (RCA

output, 3.5mm headphone output) to the

BOX X4.

• RCA Output : Use RCA cable to connect the RCA line

output of BOX X4 to your active (powered)

speakers. Or use RCA cable to connect the

RCA line output of BOX X4 to your amplifier,

then use speaker’s wire to connect the

amplifier with your passive speakers.

• 3.5mm Headphone Output : Use 3.5mm headphone line

to connect the 3.5mm

headphone output of BOX X4

to your headphone.

Step 3 (INPUT) : Connect the audio source (MM turntable

input, 3.5MM AUX input) to the BOX X4.

• MM Turntable Input : Use RCA Cable to connect your MM

turntable to the RCA inputs of

BOX X4, then connect the

ground wire of your MM turntable to

the grounding post of BOX X4.

Note 1: If your MM turntable is no need to connect a ground

wire, the ground wire can be omitted.

Note 2: MM Turntable Input can only be connected to the

turntable, and cannot be used as a normal preampli

fier connected to other audio sources, such as

mobile phones, MP3, etc.

• 3.5mm AUX Input : Use a 3.5mm Audio cable to connect

the BOX X4 and your device.

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Fosi Audio BOX X4 Phono Preamp with JAN 5654W Vacuum Tubes