Fosi Audio Box X2 Phono Preamplifier

Description

Fosi Audio Box X2 Phono Preamplifier

The Fosi Audio Box X2 Phono Preamplifier is a compact ultra-low noise phono turntable preamp that converts phono signals to line level signals, which will provide you with serious sound performance.

FAQ’s

1. Is the Box X2 a true tube phono preamp, and how does its tube stage affect sound?
   The Box X2 uses a hybrid design where vacuum tubes act primarily as a buffer stage to impart a bit of tube-like warmth and character, rather than being the main gain element as in high-end tube phono stages. It still delivers a rich, warm sound that contrasts with purely solid-state preamps, though it won’t match expensive vintage tube rigs in complexity or depth.
2. What gain levels does it offer and why does that matter for audiophiles?
   It provides three selectable gain settings (39 dB, 42 dB, 45 dB) so you can optimize the preamp’s output to match various cartridges and downstream equipment. This helps prevent overload or noise while preserving dynamic range, crucial for getting the best out of your vinyl’s frequency detail.
3. How does the Box X2 handle noise, grounding, and hum on analog setups?
   The unit includes a grounding post that lets you securely attach your turntable’s ground wire, which significantly reduces hum and low-frequency noise. With quality tubes installed and proper setup, it can provide a cleaner, more silent background compared to many built-in phono stages.
4. Can I upgrade or roll tubes for better performance?
   Yes the Box X2 ships with installable vacuum tubes and allows tube rolling. Many audiophiles experiment with higher-quality NOS or matched tubes to subtly tweak the sound’s warmth and balance, though results vary by tube type and system synergy.
5. How does the Box X2 compare to built-in phono stages in integrated amps/turntables?
   Most users report a noticeable improvement in clarity, richness, and dynamic expression over basic built-in phono stages in amplifiers or turntables especially in bass control and midrange presence. While it won’t rival flagship audiophile phono stages, it’s an excellent value step-up that brings out more musical detail in vinyl playback.

Features

Tube Phono Preamplifier

Converts phono signals to Line Level Signals with Low-noise integrated circuits and high-quality components to remove low-frequency noise ensure clear sound quality;

The Gain Setting

4-levels of output level setting (OFF/39/42/45 dB). It can keep the purity of the sound and avoid the resistor influence.

Two Input Way

Preamplifier input(CD/DAC/Phone/TV etc.), MM input. The preamp comes with a 12V power supply.MM Grounding post to protect your MM.

Matched Tubes

Tubes can be replaced by JAN 5654W/6K4/6J1/6J4/GE5654/6AK5/66*In tubes etc, Different tubes with different sounds.

Specifications

• Model : BOX X2
• Input Mode : RCA+3.5mm AUX
• Output Mode : Active Speakers
• Frequency Response : Standard RIAA
• THD : ≤ 0.1%
• SNR : ≥ 98dB
• Product Weight : 0.66 lb/300g
• Device Dimension : 4.66 inch/3.85 inch/1.29 inch
• DC Input Range : 12V
• Input Voltage Range : AC 110V – 240V
• Output Voltage Level : 600 Mv @3mV 1kHz
• Power Supply : 12V 1.5A