Fosi Audio BOX X4 Phono Preamplifier Headphone Amplifier with 6J1 Vacuum Preamplifier for MM Turntables and Preamplifier for Record with and Treble

【Important Notice for International Buyers – Tomoayax Premium Audio Hi-Fi Japan】

■ Voltage Compatibility This product is designed exclusively for use in Japan (AC 100V, 50/60Hz).

Many regions use 120V or 220–240V. Using this product without a proper transformer in such voltage environments may result in malfunction, overheating, or serious and irreversible damage.

■ Plug Type This product uses a Japanese plug (Type A or B). A plug adapter may be required depending on your region.

■ Transformer Requirement (Very Important) A transformer is required for safe use.

A plug adapter only changes the plug shape and DOES NOT convert voltage. Using this product without a transformer may cause serious and irreversible damage.

■ Buyer Responsibility As this is high-end audio equipment, the buyer is fully responsible for confirming compatibility with their local voltage (100V / 120V / 220–240V) and usage environment before purchase.

■ No Return / No Refund Policy We do NOT accept returns or refunds for: ・Voltage mismatch (including 120V and 220–240V environments) ・Use without a transformer ・Plug incompatibility ・Damage caused by improper setup or usage

■ Liability We are not responsible for any damage, malfunction, or performance issues caused by improper use or incorrect voltage conditions.

■ Final Notice Please ensure full understanding of the above before purchasing. Use only under the correct voltage environment. [Upgraded Version]: Upgraded from the Fosi Audio BOX X2. This is a next-generation phono preamplifier that delivers overwhelmingly high sound quality. 【6J1 Vacuum Tube MM Phono Preamplifier】: The BOX X4 phono preamplifier 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, resulting in clear sound quality. It is also equipped with a ground terminal to protect the turntable. 【Vacuum Tube Headphone Amplifier & Preamplifier】: The BOX X4 is equipped with 3.5mm AUX headphone and RCA outputs, making it more convenient than you might imagine. [Compatible Vacuum Tube Models]: 6K4/6J1/6J4/GE5654/6AK5/66*. You can DIY your stereo system by changing the vacuum tubes. Enjoy different sounds with different vacuum tubes. 【Package Contents】: Box x4 phono preamplifier, DC12V power supply, user manual. Comes with a 24-month warranty, guaranteeing reliable performance and customer satisfaction. Input Interface: 3.5 mm turntable input, 3.5 mm aux input, 12 V DC input Output Interface: RCA output, 3.5 mm headphone output Output: Active (powered) speakers, amplifiers, headphones Applicable Headphone Type: 16Ω Output Voltage Level: 1 kHz and 650 mV SNR ≥ 70 dB THD ≤ 0.1 % Frequency Response: Standard RIAA