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
$69.99
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Price: $69.99
(as of Jun 10, 2025 09:31:00 UTC – Details)
Product Description
Fosi Audio BOX X2 Tube MM Phono Preamplifier
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. Fosi Audio BOX X2 Tube MM Phono Preamplifier Merchant Video
Tube MM Phono Preamplifier/Tube Preamp
With RCA and 3.5mm AUX inputs, the BOX X2 offers flexibility to connect with various audio sources, making it a versatile addition to different systems.
Power Adapter: 12V/1A; Adapter Input Voltage Range: AC 110V – 240VOutput Voltage Level: 600 Mv @3mV 1kHzFrequency Response: Standard RIAA; SNR ≥ 98dB; THD ≤ 0.1%
Clear Sound with Low Noise Circuitry
Enjoy clear and detailed sound with advanced low-noise design, delivering an authentic experience.
4-Level Gain Adjustment for Any Setup
Adjust sound with 4 gain settings for precise customization on any amplifier or speaker setup.
Minimalist Design for Any Space
The BOX X2’s sleek and compact form easily fits into any audio setup, offering style and function.
Replaceable Vacuum Tubes for Unique Tones
Achieve warm, vintage sound or modern, clear tones by replacing vacuum tubes for personalized audio.
1 Superior Audio Quality
2 Adjustable Gain Control
3 Sleek and Compact
4 Customizable Sound
Perfect Addition to Your Vinyl Setup
Turn your home into a sound haven with BOX X2, enhancing the sound of your vinyl collection.
Compatible with most MM phono turntables
Easily connects to MM phono turntables, offering a variety of choices for vinyl equipment.
3.5mm AUX Input for Easy Connections
Easily connect your phone, tablet, or other devices via the 3.5mm AUX input for more audio options.
Enhance Focus with Clear, Crisp Sound
Enjoy better audio quality in your workspace, helping you focus on tasks or relax with music.
1 Home Audio Upgrade
2 For Turntables
3 Desktop Audio Setup
4 Work in Harmony
1 Front Panel
2 Rear Panel
3 Top View
4 Side View
Product Advantages 
RCA for MM Turntable Preamp
Ideal for MM cartridges, this mini preamp features precise RIAA equalization and low noise. It includes stereo RCA inputs and outputs.
AUX for Tube Preamplifier
Audiophile-grade amplification with low-noise operational preamps, plus a tube preamp and 3.5mm AUX input. Crafted from high-quality components.
Elegant Vacuum Tube Design
The visible vacuum tubes give a retro aesthetic while offering enhanced sound quality.
Circuit Board Layout
The circuitry is meticulously arranged to minimize interference and maximize sound quality.
Which Preamplifier Do You Want to Choose?
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Customer Reviews
4.6 out of 5 stars 2,888
4.4 out of 5 stars 1,530
4.4 out of 5 stars 220
4.1 out of 5 stars 775
4.0 out of 5 stars 75
4.3 out of 5 stars 326
4.5 out of 5 stars 17
Price
$69.99$69.99
$35.99$35.99
$71.99$71.99
$71.99$71.99
$104.49$104.49
$79.99$79.99
$119.99$119.99
Type
Phono Preamp with Vacumm Tubes
Phono Preamp
Phono Preamp with Vacumm Tubes
Phono Preamp with Vacumm Tubes
Phono Preamp
Headphone Amp +Preamp
Headphone Amp+DAC Tube Preamp
Input
RCA+3.5mm AUX
RCA
Bluetooth + AUX + RCA
RCA+3.5mm AUX
MM+MC RCA
Bluetooth + RCA
Bluetooth+USB+Optical+Coaxial
Output
RCA
RCA + Headphone
RCA
RCA+3.5mm AUX
RCA
RCA + 3.5mm Headphone + AUX
RCA + 3.5mm Headphone
Treble & Bass Control
✘
✘
✔
✔
✔
✔
✔
THD
≤ 0.1%
≤ 0.08%
≤ 0.1%
≤ 0.1%
≤0.009%
≤ 0.02%
＜0.03%
SNR
≥ 98dB
≥ 70dB
≥ 70dB
≥ 70dB
≥ 92dB
≥103dB
≥103dB
Power Adapter
12V/1.5A
12V/1.5A
12V/1.5A
12V/1.5A
AC 16V
12V/1.5A
12V/1.5A
Work Voltage
AC 110V – 240V
AC 110V – 240V
AC 110V – 240V
AC 110V – 240V
AC 16V
AC 110V – 240V
AC 110V – 240V
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 grounding post
3 Switchable Gain Modes: You can switch between 3 modes: 39, 42, or 45 dB. High compatibility and customizable control are provided by the adjustable gain levels. Also, it has very good circuitry and entry-level, high-end analog sound
Tube Preamplifier: With a 3.5mm AUX input, it’s also a tube preamp. Fosi Audio used high-quality component parts for the design and assemblage of this phono preamplifier. You can enjoy a very warm and smooth sound
Applicable Vacuum Tube Model: The compatible vacuum tube models are 6K4, 6J1, 6J4, GE5654, 6AK5, 66, etc. To make changes to your stereo system yourself, simply swap out the vacuum tubes. Consider that distinct tubes produce various sounds
Package Content: You will get 1 x Box X2 phono preamp, 2 x vacuum tubes, 1 x RCA cable, 1 x power adaptor, and 1 x user manual
Customers say
Customers find the phono preamp delivers amazing sound quality with warm bass and no hum, while working well with AT-LP120 Direct Drive turntables. They appreciate its retro tube design, build quality, and ease of setup, with one customer noting it hooks up easily to their turntable. Customers praise its clarity, with one mentioning it brings out subtleties in music, and consider it a budget-friendly option that performs better than DJ preamps.
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