---
product_id: 161148110
title: "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"
brand: "fosi audio"
price: "$160.01"
currency: USD
in_stock: true
reviews_count: 13
category: "Fosi Audio"
url: https://www.desertcart.us/products/161148110-box-x2-phono-preamp-mini-stereo-audio-hi-fi-preamplifier
store_origin: US
region: United States of America
---

# Compatible with multiple vacuum tube models 12V DC power supply for stable performance 3 switchable gain modes (39/42/45 dB) 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

**Brand:** fosi audio
**Price:** $160.01
**Availability:** ✅ In Stock

## Summary

> 🎵 Elevate your vinyl vibes with warm, customizable tube power!

## Quick Answers

- **What is this?** 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 by fosi audio
- **How much does it cost?** $160.01 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/161148110-box-x2-phono-preamp-mini-stereo-audio-hi-fi-preamplifier)

## Best For

- fosi audio enthusiasts

## Why This Product

- Trusted fosi audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Warm Analog Sound:** Experience rich, smooth audio with premium tube preamplifier circuitry.
- • **Noise-Free Clarity:** Advanced low-noise ICs and grounding post eliminate hum and interference for pristine playback.
- • **Precision Gain Control:** Tailor your sound with three distinct gain settings for flawless volume balance.
- • **Plug & Play Convenience:** Includes RCA cable, power adapter, and vacuum tubes for instant setup and upgrade.
- • **Universal Tube Compatibility:** Easily swap vacuum tubes (6K4, 6J1, 6J4, and more) to customize your sonic signature.

## Overview

The Fosi Audio Box X2 is a compact, high-fidelity phono preamplifier designed for MM turntables, featuring three selectable gain modes (39, 42, 45 dB) and compatibility with various vacuum tubes to tailor sound warmth and clarity. Powered by a stable 12V DC supply, it reduces noise via advanced circuitry and grounding, delivering clear, rich analog audio. The package includes essential accessories for quick setup, making it a versatile, budget-friendly upgrade for audiophiles seeking enhanced vinyl playback.

## Description

Product description Fosi Audio Box X2 Phono Preamp 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/1.5A; Adapter Input Voltage Range: AC 110V - 240V 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. Friendly Solutions Guide for BOX X2 Phono Preamp 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.

Review: Moving Coil vs Moving Magnet cartridges - Let's jump right to the most glaring bit of misinformation floating around the reviews here. Several reviewers here are stating this pre-amp is for moving magnet type phono cartridges only. NOW I can't speak for ALL "moving coil" carts, but my, Denon DL 103, moving coil, has no apparent (audible) issues with this amp. None. Sounds perfect. I've been transferring my Vinyl to bits and my disk recorder (records like a tape deck but to a CD) was getting really low levels. I could correct this after the fact with SW with no quality issues, but it was awkward. This amp was just the boost I needed. (no gain control on the recorder) SO the selectable output level switch is nice. I'm ok at the lowest, better at the middle, and just a showing a flicker of red on the highest. This was first time I'd ever seen level-leds show any red. Bottom line, Great little amp for the $. Works with any modern, quality cartridge/turntable. You'll notice the instructions don't say jack about "only moving magnet", but the input is labeled "MM". perhaps that's where the confusion sprang from. Fosi may have done that simply because moving magnet are typically less expensive and hence are likely to be what most people will have. The other thing the instructions don't say what input on your main amp/receiver to plug the output from the fosi into. It's just says "connect to your amp" for the record it's Line In or Aux, NOT phono. I plugged mine direct into the line in on my recorder and returned to the amp from the recorder. Lastly Packing. Several guys groused loudly about packing. Mine too was shipped in plain thin, bubble wrap-type bag. But that's fine the way the tubes are packed inside the Fosi box, you could drop the box from 5 feet(ish) over and over and not damage anything but the outside of the box. Final tip. Installing the tubes. They go in pretty tight. So once your sure you're lined up correctly don't be afraid to lean into it a bit. UPDATE MM V MC cartridge compatibility. To be clear, at first listen, THIS particular amp, SEEMS to be fine with at least one particular MC cartg, my Denon DL-103 MC-type cart. No distortion, no hum. Output level perfect, (best on the middle gain setting of 3). But after applying a more critical "ear" I'm not convinced I'm getting all of the clarity and or fullness this legendary DL-103 is famous for. NOW there are a couple possible explanations for this that don't involve this "amp v MC cartridge compatibility" issue. Age of the cartridge being first. While it's well under the life-span limit in hours played, it IS 10 years old. Also, I have never checked, let alone adjusted, the turntable vs tone-arm for level, so there's every reason to assume this (aka "VTA") setting is not optimum. I was shocked to learn how big a SOUND difference this, the angle of the stylus to the groove (VTA) can make. (follow up on that to come) What I can say for now is that the combination of this MC cart and this amp 'sounds' correct, if not "super'. and after playing it last night for about 6 or 7 hours it doesn't appear that either the amp nor the cart is being damaged by the other. If you're wondering if your MC cart will be similarly content with this amp, be advised the "Recommended Load Resistance" on my Denon DL-103 is "100 ohm or more, (except when a transformer is provided)" I believe transformer is what some MC type carts refer to a pre-amp as. The manual for the Fosi X2 doesn't give any ohm rating, load/capacitance, resistance rating number of any kind, input or output. Bottom line this could be a viable "budget option" amp for at least some, MC type carts. Since "proper" MC pre-amp/transformers, start about double what this one costs and run as much as 4 or 5 times more expensive.
Review: Easy recommendation. - This works great, especially considering the price point. It sounds much better than the built in pre-amp inside my turntable, the difference is noticeable. I use it set at 42db. It sounds very warm. 39 db is similar in volume but not quite as warm sounding. I would definitely recommend this as an entry level phono pre-amp if you want a warmer sounding than your turntable’s built in.

## Features

- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07XNTHHBP |
| Best Sellers Rank | #5,551 in Electronics ( See Top 100 in Electronics ) #2 in Audio Component Preamplifiers |
| Brand Name | Fosi Audio |
| Customer Reviews | 4.6 out of 5 stars 3,305 Reviews |
| Item Dimensions | 4.66 x 3.85 x 1.29 inches |
| Item Weight | 0.68 Pounds |
| Item dimensions L x W x H | 4.66 x 3.85 x 1.29 inches |
| Manufacturer | Fosi Audio |
| Maximum Supply Voltage | 12 Volts (DC) |
| Minimum Supply Voltage | 12 Volts (DC) |
| Model | BoxX2 |
| Mounting Type | Freestanding |
| Number of Channels | 1 |
| Output Power | 12 Volts |
| Package Type Name | box |
| Part Number | Box X2 |
| Specification Met | Standard Riaa, Ce |
| Unit Count | 1.0 Count |
| Voltage | 12 Volts (DC) |

## Product Details

- **Item dimensions L x W x H:** 4.66 x 3.85 x 1.29 inches
- **Manufacturer:** Fosi Audio
- **Maximum Supply Voltage:** 12 Volts (DC)
- **Minimum Supply Voltage:** 12 Volts (DC)
- **Voltage:** 12 Volts (DC)

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/61xsoICTIOL.jpg)
![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 - Image 2](https://m.media-amazon.com/images/I/712mByGGT-L.jpg)
![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 - Image 3](https://m.media-amazon.com/images/I/71KHZd8JTJL.jpg)
![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 - Image 4](https://m.media-amazon.com/images/I/71NSYxRhQjL.jpg)
![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 - Image 5](https://m.media-amazon.com/images/I/71htkRqL5IL.jpg)

## Questions & Answers

**Q: My turntable has a built-in phono preamp. How do I connect it to the BOX X2?**
A: • 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.

**Q: Does the BOX X2 have any built-in tone control? Dose the BOX X2 have bluetooth?**
A: 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.

**Q: How to connect a turntable to the BOX X2 and active speakers?**
A: 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.

**Q: Can I replace the tubes in the BOX X2?**
A: 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.

**Q: Turntable has built-in preamp/line switch—Can I still use this instead of my built-in preamp?**
A: 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Moving Coil vs Moving Magnet cartridges
*by N***N on December 8, 2023*

Let's jump right to the most glaring bit of misinformation floating around the reviews here. Several reviewers here are stating this pre-amp is for moving magnet type phono cartridges only. NOW I can't speak for ALL "moving coil" carts, but my, Denon DL 103, moving coil, has no apparent (audible) issues with this amp. None. Sounds perfect. I've been transferring my Vinyl to bits and my disk recorder (records like a tape deck but to a CD) was getting really low levels. I could correct this after the fact with SW with no quality issues, but it was awkward. This amp was just the boost I needed. (no gain control on the recorder) SO the selectable output level switch is nice. I'm ok at the lowest, better at the middle, and just a showing a flicker of red on the highest. This was first time I'd ever seen level-leds show any red. Bottom line, Great little amp for the $. Works with any modern, quality cartridge/turntable. You'll notice the instructions don't say jack about "only moving magnet", but the input is labeled "MM". perhaps that's where the confusion sprang from. Fosi may have done that simply because moving magnet are typically less expensive and hence are likely to be what most people will have. The other thing the instructions don't say what input on your main amp/receiver to plug the output from the fosi into. It's just says "connect to your amp" for the record it's Line In or Aux, NOT phono. I plugged mine direct into the line in on my recorder and returned to the amp from the recorder. Lastly Packing. Several guys groused loudly about packing. Mine too was shipped in plain thin, bubble wrap-type bag. But that's fine the way the tubes are packed inside the Fosi box, you could drop the box from 5 feet(ish) over and over and not damage anything but the outside of the box. Final tip. Installing the tubes. They go in pretty tight. So once your sure you're lined up correctly don't be afraid to lean into it a bit. UPDATE MM V MC cartridge compatibility. To be clear, at first listen, THIS particular amp, SEEMS to be fine with at least one particular MC cartg, my Denon DL-103 MC-type cart. No distortion, no hum. Output level perfect, (best on the middle gain setting of 3). But after applying a more critical "ear" I'm not convinced I'm getting all of the clarity and or fullness this legendary DL-103 is famous for. NOW there are a couple possible explanations for this that don't involve this "amp v MC cartridge compatibility" issue. Age of the cartridge being first. While it's well under the life-span limit in hours played, it IS 10 years old. Also, I have never checked, let alone adjusted, the turntable vs tone-arm for level, so there's every reason to assume this (aka "VTA") setting is not optimum. I was shocked to learn how big a SOUND difference this, the angle of the stylus to the groove (VTA) can make. (follow up on that to come) What I can say for now is that the combination of this MC cart and this amp 'sounds' correct, if not "super'. and after playing it last night for about 6 or 7 hours it doesn't appear that either the amp nor the cart is being damaged by the other. If you're wondering if your MC cart will be similarly content with this amp, be advised the "Recommended Load Resistance" on my Denon DL-103 is "100 ohm or more, (except when a transformer is provided)" I believe transformer is what some MC type carts refer to a pre-amp as. The manual for the Fosi X2 doesn't give any ohm rating, load/capacitance, resistance rating number of any kind, input or output. Bottom line this could be a viable "budget option" amp for at least some, MC type carts. Since "proper" MC pre-amp/transformers, start about double what this one costs and run as much as 4 or 5 times more expensive.

### ⭐⭐⭐⭐⭐ Easy recommendation.
*by S***N on March 8, 2026*

This works great, especially considering the price point. It sounds much better than the built in pre-amp inside my turntable, the difference is noticeable. I use it set at 42db. It sounds very warm. 39 db is similar in volume but not quite as warm sounding. I would definitely recommend this as an entry level phono pre-amp if you want a warmer sounding than your turntable’s built in.

### ⭐⭐⭐⭐⭐ Amazing tiny tube preamp. Works great with Audio Technical SL-1200MK5.
*by L***L on June 24, 2025*

Amazing little amp. It looks beautiful. Provides incredibly strong signal to my speaker. I connected this little tube amp to my Audio Technica SL-1200MK5 turntable. The original output from the turntable was too low, but after adding this amp, it’s crazy loud now. Even at the lowest setting, I have to adjust my speaker to be at like 5-10% for comfortable volumes. So it definitely works! It LOOKS amazing, when warmed up, the blue lights and the soft warm orange glow of the amp looks so good. It’s small and fits right on my shelf. It comes with a GROUND screw, thank goodness for good design. My turntable has a ground pin and I didn't have a reliable place to connect it too, but glad this little unit had a place for it. The really helps eliminate any additional noise and the tube amps really help warm up the sound. Tube amps provide odd order harmonics which help make your vinyls sound richer and warmer; coming off from a digital amp, I can definitely tell the difference. Had to be a little careful when installing the tube amps, but glad we can replace them over time as needed.

## Frequently Bought Together

- 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
- Riverstone Audio - Tested/Matched Pair (2 Tubes) 7-Pin JAN 5654W Fully-Tested Vacuum Tubes - Upgrade for 6AK5 / 6J1 / 6J1P / EF95 - JAN 5654W Platinum Grade Pair
- Monoprice 1.5ft Premium 2 RCA Plug/2 RCA Plug M/M 22AWG Cable - Black

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-16*