FosiAudio
Fosi Audio Box X2 Phono Preamp, Mini Stereo Audio Hi-Fi Preamplifier with
Disclosure: We may earn a commission when you buy through links on this page, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Learn more
Check Price on AmazonHighlights
- 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
Why You'll Love It
- Converts turntable signals to line-level while reducing low-frequency noise with integrated low-noise circuits
- Tailor audio output to your setup using three selectable gain settings at 39, 42, or 45 dB
- Connect standard line sources using the dedicated 3.5mm AUX input for tube preamplification
- Swap compatible vacuum tubes easily to customize your sound profile and character
- Grounding post design safeguards your turntable setup from electrical interference
- Comes ready to hook up with included vacuum tubes, RCA cable, and power adapter
Pros
- +Three switchable gain levels
- +Includes 3.5mm AUX and phono inputs
- +Supports multiple tube replacement models
- +Built-in grounding post for turntables
- +Includes RCA cable and power adapter
Cons
- -Requires manual tube installation and swapping
- -Only compatible with MM phono setups
Detailed Review
The Fosi Audio Box X2 is a compact tube phono preamplifier designed to convert MM turntable signals into standard line-level output while removing low-frequency noise. It suits vinyl enthusiasts looking to add warm, smooth tube amplification to their audio setup without dealing with overly complex gear.
A standout feature is the selectable gain switch, which lets you toggle between 39 dB, 42 dB, and 45 dB to match your equipment. In addition to phono use, it features a 3.5mm AUX input so you can run other audio devices through the vacuum tubes. A dedicated grounding post is also built in to safeguard your turntable during operation.
For those who like to experiment with their audio profile, the Box X2 supports tube rolling. You can replace the stock tubes with various compatible models like 6K4, 6J1, 6J4, GE5654, 6AK5, and 66, allowing you to tailor the sound signature over time.
Keep in mind that the unit is built specifically for MM phono cartridges and relies on an external power adapter. While it comes with two vacuum tubes, cables, and a power supply, users seeking a purely digital interface or built-in wireless input will need additional adapters or alternative gear.
Verdict: The Fosi Audio Box X2 is a solid choice for vinyl listeners wanting adjustable gain, tube sound, and flexible tube swapping. It delivers straightforward MM phono conversion and an extra aux input in one simple package.
Who Should Buy It
A great fit if you:
- Use an MM turntable and need to convert signals to line-level
- Want adjustable gain levels (39, 42, or 45 dB) for better gear matching
- Enjoy swapping out vacuum tubes like 6J1 or GE5654 to change your sound profile
- Want a 3.5mm AUX input to run non-turntable audio through a tube preamp
Consider something else if you:
- Need a preamplifier for non-MM turntable cartridges
- Prefer a solid-state setup without vacuum tubes to maintain or replace
FAQ
What vacuum tube models work with this preamp?
The Box X2 is compatible with 6K4, 6J1, 6J4, GE5654, 6AK5, and 66 vacuum tubes.
What gain levels are available?
You can switch between three gain settings: 39 dB, 42 dB, and 45 dB.
What accessories come in the box?
The package includes the Box X2 phono preamp, 2 vacuum tubes, an RCA cable, a power adapter, and a user manual.
Product Details
| Brand | FosiAudio |
| ASIN | B07XNTHHBP |
