Specifications:
• Fosi Audio BOX X3 is a mini stereo Bluetooth 5.0 Hi-Fi tube 
 phono preamplifier for MM turntable that features Volume 
 control and Bass/Treble control with DC 12V power supply. 
• The BOX X3 supports MM turntable input, 3.5mm AUX input 
 or Bluetooth input and RCA line output for powered 
 speakers or amplifiers for your home audio system. 
• Compact ultra-low noise phono turntable preamp that 
 converts phono signals to line level signals. 
• The BOX X3 equipping with vacuum tubes stands up to the 
 test and will provide you with serious sound performance. 


Package Contents:
Fosi Audio BOX X3 *1
Bluetooth Antenna *1
Vacuum Tube *2
DC 12V Power Adapter *1
User Manual *1

Quick Setup:
Step 1: Install the vacuum tubes to the BOX X3.
Step 2: Install the Bluetooth antenna to the BOX X3. 
Step 3: • Use RCA cable to connect the RCA line output of 
 BOX X3 to your active(powered) speakers.
 • Or use RCA cable to connect the RCA line output
 of BOX X3 to your amplifier, then use speaker’s 
 wire to connect the amplifier with your passive 
 speakers.
Step 4: Connect the power adapter to BOX X3 and the socket 
 Turn the Multi-function Knob(Volume Control/Power 
 Switch) clockwise to power on the BOX X3.The the 
 input mode indicator light (also the power indicator 
 light) of BOX X3 stays red after power is on.

Notice: BOX X3 is only a preamplifier, not amplifier, can not be connected with passive speakers directly, If you need connect BOX X3 with passive speakers, you need to connect it with an amplifier then connect the amplifier with your passive speakers.