【Voltage Compatibility】
When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction.
【Plug Type】
Our products use Japanese plug types (A or B type).
Please use a conversion adapter if necessary.
【Important Note on Transformers and Adapters】
A transformer adjusts voltage to match your device’s requirements.
A conversion adapter only changes the plug shape and does not adjust voltage.
Using only a conversion adapter without a transformer may result in damage to the product.
【Liability】
We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer.
[About clocks that synchronize time via radio waves]
The function of clocks that synchronize time via radio waves only works in the Japanese area. Please be careful.
Upgrade: Updated version of "Fosi Audio BOX X2". A next-generation phono preamplifier that delivers overwhelmingly high sound quality.
JAN 5654W Vacuum Tube MM Phono Preamp: The BOX X4 phono preamp supports 3.5MM AUX and MM turntable inputs and converts phono signals to line level signals. Low-noise integrated circuits and high-quality components eliminate low-frequency noise and provide clear sound quality. It is also equipped with a ground terminal to protect the turntable.
Vacuum Tube Headphone Amplifier & Preamplifier: BOX
Compatible vacuum tube models: 6K4/6J1/6J4/GE5654/6AK5/66 *Inside vacuum tubes, etc. You can DIY your stereo system by replacing the vacuum tubes. You can enjoy different sounds with different vacuum tubes.
Package includes: BOX X4 phono preamplifier, DC12V power supply, user manual, our worry-free 24-month warranty, and friendly customer service.
Input interface: mm turntable input, 3.5 mm aux input, 12 V DC input Output interface: RCA output, 3.5 mm headphone output Output: active (powered) speaker, amplifier, headphones Applicable headphones Type: 16Ω Output voltage level: 1 kHz and 650 mV SNR ≥ 70 dB THD ≤0.1 % Frequency response: Standard RIAA
