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 control of the BOX X4 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 X4 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 X4.
20. Why the BOX X4 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 custom-
er support email address:
12. Can I hook the BOX X4 to the power amplifier for
my system?
• Yes. You can connect the BOX X4 to the power amplifier
through the RCA output.
13. Can this work with my turntable and
headphones?
• Yes, it has headphones output. The 3.5mm AUX connector
on the front panel of the amplifier can be used for
headphone.
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.
16. Can you hook a subwoofer to this unit?
• Yes, if your subwoofer is powered, you can connect the BOX
X4 directly to the subwoofer, but you need add a sub
amplifier between the BOX X4 and the subwoofer if your
subwoofer is passive subwoofer.
17. Which vacuum tube can be replaced to the BOX
X4?
• If necessary, tubes below are substitutions: EF95, 6AK5,
6AK5W, 403A/403B, 6J1, 6J1P, 6J2, 6J3, 6J4, 6J5 vacuum
Summary of Contents for BOX X4
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