Fosi Audio BOX X3 User Manual Download Page 7

When the connection is completed, Please turn on the BOX X3 
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 X3, 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.

Troubleshooting/QA

1: Get noise/humming when turn the BOX X3 on?

• Please know that when no inputs connected to BOX X3, 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 X3, then turn it on to   
  check if the noise still or not.
• If the noise disappear, the noise may from the 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 X3 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 X3 to   
  check if the noise volume follows or not.

Note2:

 

MM Turntable Input can only be connected to the 

              turntable, and cannot be used as a normal preamplifier 
              connected to other audio sources, such as mobile 
              phones, MP3, etc.

(2):

 

3.5mm Input: Use a 3.5mm Audio cable to connect the BOX               

                              X3 and your device. 

Note:

 Once 3.5mm AUX plug in ,the MM input will automatically 

           interrupted, so the input mode will turn to 3.5mm AUX 
           input.

(3): Bluetooth Input: Turn on the Bluetooth on your device, then 
                                    select "BOX X3" for pairing, the input mode 
                                    indicator light will stays blue after a 
                                    successful connection. 

Note 1:

 Once Bluetooth is connected, the MM turntable input 

               and 3.5MM AUX input will be interrupted. If you want to 
               use the RCA input again, just disconnect the Bluetooth.

Input priority:

  Bluetooth Input > 3.5MM AUX input > MM 

                             turntable input. 

Note 2:

 

Input Indicator Light : After BOX X3 is powered on, 

               the input indicator light on the front panel stays red 
               either 3.5MM AUX input or MM turntable input is 
               successfully connected, and the input indicator light on   
               the front panel of BOX X3 stays blue when Bluetooth 
               input is successfully connected. 

Note :

 Please keep the BOX X3 away from other electric 

               device. The BOX X3 can't use with a radio 
               simultaneously.

Summary of Contents for BOX X3

Page 1: ...Thanks for choosing us Fosi Audio BOX X3 Tube MM Phono Preamp User Manual ...

Page 2: ...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 Input Interface Output Interface MM turntable input 3 5MM AUX input Bluetooth input 12V DC input RCA output Product Adapter Input Voltage Range AC 100V 240V DC Input Voltage 12V Output Voltage Level 1kHz and ...

Page 3: ...tion Knob Volume Control Power Switch 4 5 Front Panel DC Input Bluetooth Antenna Interface RCA Output 6 7 8 MM Turntable Input Grounding Post Bluetooth Antenna 9 10 11 Back Panel 6 7 8 9 10 WWW fosiaudio com ANT OUTPUT MMINPUT R L R L GND DC 12V 2 3 4 5 BOX X3 TUBE MM PHONO PREAMP INPUT Red AUX TREBLE BASS Vol Blue BT 1 ...

Page 4: ...nna 1 Vacuum Tube 2 DC 12V Power Adapter 1 User Manual 1 MM Turntable Input BOX X3 Preamp Tablet Laptop PC TV PS4 DVD Phone Tablet Laptop Active Speakers Passive Speakers Power Amp 3 5mm AUX Input Bluetooth Input OR WWW fosiaudio com ANT OUTPUT MMINPUT R L R L GND DC 12V ...

Page 5: ...X X3 stays red after power is on 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 X3 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 c...

Page 6: ...ill stays blue after a successful connection Note 1 Once Bluetooth is connected the MM turntable input and 3 5MM AUX input will be interrupted If you want to use the RCA input again just disconnect the Bluetooth Input priority Bluetooth Input 3 5MM AUX input MM turntable input Note 2 Input Indicator Light After BOX X3 is powered on the input indicator light on the front panel stays red either 3 5M...

Page 7: ... inputs connected to BOX X3 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 X3 then turn it on to check if the noise still or not If the noise disappear the noise may from the the audio source or audio cable please ex...

Page 8: ......

Page 9: ...s issue Please reconnect the power adapter to the BOX X3 to try again Note If the noise still please contact us via email at support fosiaudio com BOX X3 is a preamplifier not a power amplifier can not be connected with passive speakers directly 2 All cables are connected but there is no audio output Please check if your audio source BOX X3 amplifier or powered speakers all are turned on and in wo...

Page 10: ...to replace the BOX X3 Note Make sure that all the cables are completely pushed into the device 3 My Bluetooth device cannot pair with BOX X3 Make sure that BOX X3 is powered on Make sure that BOX X3 is not paired with other devices Make sure that the distance between your device and BOX X3 is not too long close your device to BOX X3 to have a try Make sure there are no obstacles between your devic...

Page 11: ...etween the three inputs Bluetooth input 3 5MM AUX Input MM Turntable input 7 Can I connect a headset and the active speakers to the BOX X3 3 5mm AUX input simultaneously No the BOX X3 is designed with a 3 5 MM AUX input not the 3 5MM AUX headphone output But you can connect to the powered active speakers from the RCA output connectors Note BOX X3 is a preamplifier if you want to connect it to pass...

Page 12: ...lifier for my system Yes You can connect the BOX X3 to the power amplifier through the RCA output 13 Can this work with my turntable and headphones No it s not design for headphones and the 3 5mm AUX connector on the front panel of the amplifier is input not output 14 Can I directly connect this phono preamp to the speakers If your speakers are powered speakers you can directly connect this preamp...

Page 13: ...st the treble and bass of the BOX X3 to achieve the right tone Please try to change the sound source and cables to test 19 Can it be left on all the time The BOX X3 is designed with a power switch It can stay connected safely without power consumption all the time you only need to turn off the power switch on the BOX X3 20 Why the BOX X3 came with a broken vacuum tube Due to long distance transpor...

Page 14: ...s have an 18 month limited warranty on parts and labor from the date of purchase Please contact us if you have any problems About Fosi Audio Fosi Audio designs and builds innovative audio products with all your music in mind Great sound simple but elegant designs high quality materials and truly useful features are what Fosi Audio is about We sincerely hope you get as much enjoyment from our produ...

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