Home / Fosi Audio Box X2 Phono Preamp, Mini Stereo Audio Hi-Fi Preamplifier with Gain Gear, Pre-Amplifier for MM Turntable Phonograph and Record Player, with DC 12V Power Supply

Fosi Audio Box X2 Phono Preamp, Mini Stereo Audio Hi-Fi Preamplifier with Gain Gear, Pre-Amplifier for MM Turntable Phonograph and Record Player, with DC 12V Power Supply

Tube MM Phono Preamplifier: This Fosi Audio phono preamplifier removes low-frequency noise and ensures clear sound quality by converting phono signals to line-level signals using high-quality components and low-noise integrated circuits. It is designed to safeguard your turntable thanks to its groun

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Detail
Output Voltage Level: 600 Mv @3mV 1kHz
Frequency Response: Standard RIAA; SNR ≥ 98dB; THD ≤ 0.1%
Output Impedance: 280Ω; Size: 4.66 x 3.85 x 1.29 inches; Weight: 10.9 ounces.

Ideal for MM cartridges, this mini preamp featuresprecise RIAA equalization and low noise. It includes stereo RCA inputsand outputs.

Audiophile-grade amplification with low-noise operational preamps, plus atube preamp and 3.5mm AUX input. Crafted from high-quality components.

The visible vacuum tubes give a retro aesthetic while offering enhanced sound quality.

The circuitry is meticulously arranged to minimize interference and maximize sound quality.

My turntable has a built-in phono preamp. How do I connect it to the BOX X2?
• If the turntable has a built-in phono preamp, switch it to "Line Out" mode and connect it to the 3.5mm input on the BOX X2.

• If the turntable is set to "Phono" mode, connect it to the MM input on the BOX X2 for optimal sound.
Does the BOX X2 have any built-in tone control? Dose the BOX X2 have bluetooth?
No. The BOX X2 don't have bluetooth. And the BOX X2 features gain control, not tone control. For enhanced tonal shaping, consider using models like BOX X4, which includes treble and bass adjustments. For bluetooth consider using models like BOX X3.
How to connect a turntable to the BOX X2 and active speakers?
Make sure the turntable has a Phono output with an MM cartridge. Some turntables have a built-in phono preamplifier, set it to Phono switch.
Can I replace the tubes in the BOX X2?
You can substitute with 7-pin tubes such as 6AK5, 6AK5W, 6Zh1P, 6J1, and 6J1P. These can also directly replace WE-403A, WE-403B, EF95, 6A2 tubes, 5725w tubes and standard 5654 tubes.
Turntable has built-in preamp/line switch—Can I still use this instead of my built-in preamp?
Yes, deselect the preamp on your turntable.

Note: Please confirm whether your turntable has a built-in phono preamp, if there is a phono preamp, and it cannot be deselected, then you can only connect 3.5 mm input, can not connect MM Turntable input.

I. Compatibility Limitations

1. Compatibility: The BOX X2 Output Impedance: 280Ω. Power adapter: 12V/1.5A; adapter input voltage range: AC 110V - 240V. Please use a matched power adapter and an amplifier with matched impedance to avoid incompatibility.(Does not support MC turntable)

2. Connections: The BOX X2 with RCA and 3.5mm AUX inputs. Please make sure that your turntable is MM output and also make sure that it is phono output, this situation the MM turntable can only insert RCA input. If the turntables built-in phono preamplifier, so it should connect the 3.5mm AUX input on the BOX X2 not the RCA phono input. The other device(e.g. Laptop, PC, Phone, Tablet, TV, DVD, etc.) can only insert 3.5mm AUX input. Not support Bluetooth, can connect to a pair of active speakers, but need to add an amplifier or receiver to the passive speakers.

3. For details on how to use the BOX X2 with a record player that has a built-in phono amplifier. If the turntable has a built-in phono preamp, switch it to "Line Out" mode and connect it to the 3.5mm input on the BOX X2. If the turntable is set to "Phono" mode, connect it to the MM input on the BOX X2 for optimal sound.

Note: The 3.5mm port on the front of the BOX X2 is an AUX input port and cannot be used to connect headphones.

II. Function & Sound Quality- Related Solutions

1. Cable Issues: Ensure all plugs (e.g., 3.5mm AUX Input, MM Turntable input, RCA output) are fully inserted and match the device specifications. Reseat any loose connections. Ensure all cables are correctly connected, secure, and in good condition.

2. Tube Installation: Make sure the tube pins are properly lined up with the tube socket; Please manually straighten the pins if the pin is deformed.

3. Gain Setting: 4-levels of output level setting (OFF/39/42/45 dB). Offers gain adjustment, allowing you to control the amplification level of the input signal, rather than directly controlling the volume level. The higher the gain is set, the greater the likelihood of distortion. It is recommended to prioritize adjusting the volume control knob on the speaker.

Please know that when no inputs connected to BOX X2, the default input way is MM input mode, in this mode, the gain of the amplify is much large then other input modes, so it’s normal that will have some humming sound when no sound pass through.

Fosi Audio Box X2 Phono Preamp

Tube MM Phono Preamplifier/Tube Preamp

Clear Sound with Low Noise Circuitry

4-Level Gain Adjustment for Any Setup

Minimalist Design for Any Space

Replaceable Vacuum Tubes for Unique Tones

Perfect Addition to Your Vinyl Setup

Compatible with most MM phono turntables

3.5mm AUX Input for Easy Connections

Enhance Focus with Clear, Crisp Sound

Product Advantages

RCA for MM Turntable Preamp

AUX for Tube Preamplifier

Elegant Vacuum Tube Design