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15. Can you hook a subwoofer to this unit?
• Yes, if your subwoofer is powered, you can connect the BOX X2
directly to the subwoofer, but you need add a sub amplifier
between the BOX X2 and the subwoofer if your subwoofer is
passive subwoofer.
16. Which vacuum tube can be replaced to the BOX X2?
• If necessary, tubes below are substitutions: GE 5654 EF95, 6AK5,
6AK5W, 403A/403B, 6J1, 6J1P, 6J2, 6J3, 6J4, 6J5 vacuum tubes,
etc. You can replace the vacuum tubes to DIY your stereo system.
17. Sound quality is not good?
• Make sure all the cables are fully connected.
• Adjust the gain of the BOX X2 to achieve the right tone.
• Please try to change the sound source and cables to test.
18. Can it be left on all the time?
• The BOX X2 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 X2.
19. Why the BOX X2 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: suppor[email protected]
Comparison Section
Model
Type
Phono Preamp/
Headphone
amplifier
Phono Preamp Phono Preamp Phono Preamp/
Headphone
amplifier
Input
RCA RCA+3.5mm AUX MM turntable
input+
3.5MM AUX input
+ Bluetooth input
MM Turntable+
3.5mm AUX
Output Powered Speakers
+ Headphone
Powered
Speakers
RCA output Powered
Speakers
+Headphone
THD ≤ 0.08% ≤ 0.1% ≤ 0.1% ≤ 0.1%
SNR ≥ 70dB ≥ 98dB ≥ 70dB ≥ 70dB
Power Adapter 12V/1.5A 12V/1.5A 12V/1.5A 12V/1.5A
BOX X1 BOX X2 BOX X3 BOX X4
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