With its BOX X3 tube preamplifier, big brother to the BOX X2, Fosi Audio unveils an affordable, high-quality Hifi device for those wishing to enjoy the warm, coated sound of tube amplification. A blend of vintage and modern technology, the BOX X3 also features Bluetooth 5.0 functionality for wireless audio sources.

On the front, the BOX X3 features a volume control with bass and treble adjustment, plus a 3.5mm jack auxiliary input for connecting various audio sources such as a telephone, DAC, or others. The rear panel features a stereo RCA input and output with a GND terminal for phono coupling with a turntable (MM).

The FOSI Audio BOX X3 is the ideal companion for a power amplifier or a pair of active speakers. It will boost the sound quality of your hi-fi system. Supplied with a pair of GE5654 tubes (7-pin), these can be easily replaced by 5654W / 6K4 / 6J1 / 6J1P / 6J2 / 6J3 / 6J4 / 6J5 / 6AK5 / 6K4 / 6ZH1P / 4.3a / 4.3B / EF95 tubes, if you prefer a different sound. Overall, the BOX X3 is an excellent entry-level preamplifier.