Fosi Audio Box X2 Tube Phono Pre Amplifier

Highlights:

• Compact RIAA phono preamplifier for MM cartridges
• Two replaceable vacuum tubes let you fine-tune the sound character
• Three gain settings: 39, 42 and 45 dB
• Additional 3.5 mm AUX input for line-level audio sources
• RCA output for an amplifier or active speakers
• Ground terminal for the turntable's ground wire
• RCA cable, power supply and two vacuum tubes included

Give your turntable a tube phono preamplifier:

The Fosi Audio Box X2 is a compact phono preamplifier that makes it easy to connect a turntable with an MM cartridge to an amplifier or a pair of active speakers with a line input. Built-in RIAA equalisation corrects the signal from the cartridge, while low-noise circuitry amplifies it to a level suitable for the rest of your audio system. Two vacuum tubes form part of the preamplifier's design and contribute to the smooth, warm sound character that many listeners appreciate in tube-based hi-fi. The Box X2 also has a ground terminal for connecting the turntable's ground wire to help reduce the risk of hum.

Adjust the gain and connect additional audio sources:

With three selectable gain settings of 39, 42 and 45 dB, you can match the amplification to the output level of your MM cartridge and the needs of your system. The Box X2 is also more than a conventional RIAA phono preamplifier. Its separate 3.5 mm AUX input lets you connect a line-level audio source and use the unit as a tube preamplifier. When a plug is inserted into the AUX input, this input automatically takes priority over the phono input. You therefore need to unplug the AUX cable to play records again. The signal is passed on through the RCA output to the downstream amplifier or active speakers.

Swap the tubes and shape the sound to your taste:

The two vacuum tubes are easily accessible on top of the Fosi Audio Box X2 and can be replaced with compatible types such as 6K4, 6J1, 6J4, GE5654 and 6AK5. This gives you the opportunity to explore how different tubes influence the listening experience, a practice known as tube rolling. One option is a compatible, matched pair of JAN 5654W tubes. The Box X2 is designed for turntables with MM cartridges and does not directly support MC cartridges. It also has no built-in power amplifier, so passive speakers must be connected through a separate amplifier.

Specifications:

• Model: Fosi Audio Box X2
• Cartridge type: Moving Magnet (MM)
• Phono input: RCA with RIAA equalisation
• Additional input: 3.5 mm AUX (line)
• Output: RCA line-out
• Gain: 39 / 42 / 45 dB
• Frequency equalisation: Standard RIAA
• Output level: 600 mV at 3 mV / 1 kHz
• Total harmonic distortion (THD): = 0.1%
• Signal-to-noise ratio (SNR): = 98 dB
• Tubes: 2, replaceable
• Compatible tube types: 6K4, 6J1, 6J4, GE5654 and 6AK5
• Power supply: DC 12 V / 1.5 A
• Included adapter: 100-240 V AC
• Dimensions: approx. 3.3 x 9.8 x 11.85 cm (H x W x D)
• Weight: approx. 300 g
• Included: 2 vacuum tubes, RCA cable, power supply and user manual