16. Can you hook a subwoofer to this unit?
• Yes, if your subwoofer is powered, you can connect the BOX
X3 directly to the subwoofer, but you need add a sub amplifier
between the BOX X3 and the subwoofer if your subwoofer is
passive subwoofer.
17.Which vacuum tube can be replaced to the BOX X3?
• If necessary, tubes below are substituttions:
6K4/6J1/6J4/GE5654/6AK5/66*In vacuum tubes, etc. You can
replace the vacuum tubes to DIY your stereo system.
18. Sound quality is not good?
• Make sure all the cables are fully connected.
• Adjust 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 transportation, the vacuum tube may be
damaged during transportation. If you find that the vacuum
tube is damaged or other problems, please contact Fosi Audio
after-sales email immediately, and we will replace the vacuum
tube for you.
Any problems please leave a message to the customer
support email address: [email protected]
9. How to attach ground wire?
• There is a post to attach the ground wire.
10. Is the gain enough to support MC cartridge?
• No. It is for MM cartridge.
11. My turntable has a selectable built-in phono preamp
or switch to the line. Can I still use this instead of
my built-in pre-amp?
• Yes, deselect the preamp on your turntable.
12. Can I hook the BOX X3 to the power amplifier 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 to the speakers. But you need to add an
amplifier or receiver to the passive speakers.
15. What equalization is incorporated in this preamp?
• RIAA equalization.
