---
product_id: 292176616
title: "Fosi Audio Box X1 Phono Preamp for MM Turntable Mini Stereo Audio Hi-Fi Phonograph/Record Player Preamplifier with 3.5MM Headphone and RCA Output with DC 12V Power Supply"
brand: "fosi audio"
price: "€ 72.73"
currency: EUR
in_stock: true
reviews_count: 13
category: "Fosi Audio"
url: https://www.desertcart.pt/products/292176616-fosi-audio-box-x1-phono-preamp-for-mm-turntable-mini
store_origin: PT
region: Portugal
---

# Stable DC 12V power supply 3.5mm headphone + RCA output 2V max output voltage Fosi Audio Box X1 Phono Preamp for MM Turntable Mini Stereo Audio Hi-Fi Phonograph/Record Player Preamplifier with 3.5MM Headphone and RCA Output with DC 12V Power Supply

**Brand:** fosi audio
**Price:** € 72.73
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your vinyl game with flawless sound clarity and pro-level connectivity!

## Quick Answers

- **What is this?** Fosi Audio Box X1 Phono Preamp for MM Turntable Mini Stereo Audio Hi-Fi Phonograph/Record Player Preamplifier with 3.5MM Headphone and RCA Output with DC 12V Power Supply by fosi audio
- **How much does it cost?** € 72.73 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/292176616-fosi-audio-box-x1-phono-preamp-for-mm-turntable-mini)

## 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

- • **Rugged Aluminum Build:** Durable black anodized steel casing ensures long-lasting, reliable performance.
- • **Dual Output Flexibility:** Simultaneously connect RCA line out and 3.5mm headphones for versatile listening setups.
- • **Plug-and-Play Simplicity:** Hassle-free setup with grounding post protection—perfect for busy professionals who demand quality without fuss.
- • **Precision RIAA Frequency Response:** Authentic sound reproduction that respects your vinyl’s original tone.
- • **Ultra-Low Noise, Pure Vinyl Vibes:** Experience crystal-clear sound with minimal interference for true audiophile quality.

## Overview

The Fosi Audio BOX X1 is a compact, high-fidelity phono preamp designed for MM turntables, delivering ultra-low noise amplification with a stable 12V DC power supply. Featuring a max 2V output, 70dB SNR, and ≤0.08% THD, it ensures precise RIAA-standard sound reproduction. Its versatile outputs include RCA line and 3.5mm headphone jacks, all housed in a durable anodized aluminum case for reliable, professional-grade audio performance.

## Description

desertcart.com: Fosi Audio Box X1 Phono Preamp for MM Turntable Mini Stereo Audio Hi-Fi Phonograph/Record Player Preamplifier with 3.5MM Headphone and RCA Output with DC 12V Power Supply : Electronics

Review: Great turntable amp - I’m very pleased with this amp. Packaged nicely. Looks great. Affordable. Sound/volume is good. works well with my turntable. Exactly what I needed. I would recommend.
Review: Simple but works great - Just right

## Features

- HASSLE-FREE PLAYBACK - The BOX X1 is an ultra-low noise phono preamp that seamlessly converts phono signals into line-level signals, featuring a grounding post for optimal turntable protection
- EXCEPTIONAL AUDIO QUALITY - Equipped with a high-quality DC12V power supply, this MM phono preamplifier offers reliable and stable performance, delivering an output voltage level of 2V max (P-P) at 10K Ohms, an SNR of 70dB, and THD of ≤0.08% @ 1kHz and 3mV, while conforming precisely to the standard RIAA frequency response
- VERSATILE CONNECTIVITY - The phono preamp provides MM turntable input, RCA line output for powered speakers, and a 3.5MM headphone output, allowing simultaneous use of RCA line output and AUX headphone output for maximum flexibility
- PERFECT INTEGRATION - Designed for vinyl record enthusiasts, this phono preamp ensures accurate sound replication with its built-in low-noise phono preamp circuitry, conforming precisely to the RIAA standard, and encased in a durable black anodized steel case for reliable and rugged audio transmission
- WHAT'S INCLUDED - Fosi Audio BOX X1 Phono Preamp x1, 12V Power Adapter x1, User Manual x1

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08TLRPMDC |
| Best Sellers Rank | #29,752 in Electronics ( See Top 100 in Electronics ) #21 in Audio Component Preamplifiers |
| Brand | Fosi Audio |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,798) |
| Date First Available | January 21, 2021 |
| Item Weight | 12 ounces |
| Item dimensions L x W x H | 7.09 x 5.12 x 2.36 inches |
| Item model number | BOX X1 |
| Language | English |
| Manufacturer | Fosi Audio |
| Material | Aluminum |
| Maximum Supply Voltage | 12 Volts (DC) |
| Minimum Supply Voltage | 12 Volts (DC) |
| Mounting Type | Freestanding |
| Number of Channels | 1 |
| Package Type Name | Retail Packaging |
| Product Dimensions | 7.09 x 5.12 x 2.36 inches |
| Specification Met | Riaa |
| Voltage | 12 Volts |

## Product Details

- **Item dimensions L x W x H:** 7.09 x 5.12 x 2.36 inches
- **Manufacturer:** Fosi Audio
- **Maximum Supply Voltage:** 12 Volts (DC)
- **Minimum Supply Voltage:** 12 Volts (DC)
- **Voltage:** 12 Volts

## Images

![Fosi Audio Box X1 Phono Preamp for MM Turntable Mini Stereo Audio Hi-Fi Phonograph/Record Player Preamplifier with 3.5MM Headphone and RCA Output with DC 12V Power Supply - Image 1](https://m.media-amazon.com/images/I/61N2wiBdvfL.jpg)

## Questions & Answers

**Q: How to adjust speaker volume (BOX X1)？**
A: The speaker volume is controlled through the volume knob on the speakers.

**Q: Is the DC input jack center-negative or center-positive (BOX X1)?**
A: It is a center-positive connector.

**Q: What is the gain (in dB) of BOX X1?**
A: The gain of the BOX X1 is 35 dB.

**Q: Can this be used with a moving coilcartridge?**
A: No,this is a MM phono preamp only.

**Q: Can this work with my turntable andheadphones?**
A: Yes,The BOX X1 is designed with 3.5MM headphone output.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great turntable amp
*by A***R on January 9, 2026*

I’m very pleased with this amp. Packaged nicely. Looks great. Affordable. Sound/volume is good. works well with my turntable. Exactly what I needed. I would recommend.

### ⭐⭐⭐⭐⭐ Simple but works great
*by J***E on January 20, 2026*

Just right

### ⭐⭐⭐⭐ Welcome to the new audio renaissance: The FOSI AUDIO BOX X1 Phono Preamplifier.
*by S***E on April 21, 2021*

FOR THOSE WHO CAN REMEMBER.... The 1970's and the first audio renaissance when every magazine, newspaper had an ad about a cool new audio product. Great times! but unfortunately, you probably had to skip a car payment. This time around in this millennia, the audio products are even better and more of them. Best part, you get to keep your car! The FOSI BOX X1 Preamplifier is just that example. UNBOXING: I bought this, the FOSI Audio BOX X1 on Amazon for $29.99. In my experience there are a lot of preamps on the market and they usually sell for $100 and much, much more. depending on what they can do so I was interested to see what this unit can do. As you open the package you see the carton is actually pretty nice. You get the impression that Fosi Audio really cares about it products and wants you to enjoy the product. Hence the inscription "Hi-Fi Made Fun" This means a lot and it's better than just a plain box. Inside you have protective foam which is holding the unit securely and was designed for this particular device. The Preamp itself, the 12 volt power supply, user's guide which incidentally, are very easy to read. All is packaged well and we're ready to go. FIRST IMPRESSIONS: When you first see the BOX X1, you notice the boxy, utilitarian design. Hence the name. Right away you realize this product is all business. Fosi could've put fancy metallic trim and more for the aesthetics but that would have been really unnecessary in this case and probably added to the cost defeating the purpose. What we're looking for here is a preamp that does what it's supposed to do and hopefully do it well. The build quality is really good. Solid. It could take some abuse. You should fully expect this product should last for a very long time. Holding it you feel some weight. Not heavy but beefy. For the most part you would lay this flat but it can be stood up on edge if space is an issue. Making it a good choice for desktop applications. I would have liked to have seen rubber feet to keep it from sliding but you can always buy them at the dollar store. On the front you have the Fosi logo, The model number in a metallic bold print and note that it says in bold print "MM Phono Preamp" which is important to know that it's for moving magnet cartridges only. If you attempt to use a moving coil cartridge or "MC" you will find that the volume is too low as MC cartridges run at a much lower voltage and need more amplification. Finally on the front you have the Power On/Off "button". Now it's unusual to see a push button on/off switch these days on a product this size but there's actually a little engineering know how here. If you were to use a toggle switch you commonly see, in time it would probably get damaged or broken off entirely because of where it's at. In this case the push button is the way to go and besides it's easier to use. The connection panel from left to right, a 3.5mm headphone jack which is an interesting point in it's own. It is actually a low-level audio output. If you connect headphones to it you will notice that it will be at a fixed volume. Usually at a "mild" volume. In the old days a DJ would use this as a "queing" device for the next record to be played. You can use this as another audio output to send to another amp, recorder or measuring device. Next you have the color coded line outputs and phono inputs, a thumb screw ground connection using either a spade connector or bare wire, and finally the 12 volt power supply jack. All seem to connect rather easily. THE SET UP: We will be using an Audio Technica AT-LP120X as a reference table. It's a proven winner and uses the ATVM95E cartridge that's been upgraded with a Shibata stylus so we know we will be sending a good signal to the BOX X1 preamp. The amplifier will be Fosi BT30D 100 watt amplifier with the Sound Appeal 6.5 bookshelf speakers. These speakers are the best budget speakers I've used and we'll get a real good sampling. It's a good habit to get into that when you go to power up the system to always turn on the preamp first before the amplifier. This will prevent speaker "bursts" which over time can damage your system. The record I've chosen is Marty Gold and his Orchestra's - Sounds Unlimited. It's actually a "Dynagroove recording and has incredible detail and dynamics. I'll also play Rachmaninoff and Led Zeppelin IV on 1080 gram vinyl for genre testing. SOUND TEST: As I listen to the Marty Gold I get that euphoria that I usually get when this record is played well. Sharp detail of the horns and strings. The quietest triangle to the loudest kettle drum. The BOX X1 is doing it's job and almost seems proud to do it. The Rachmaninoff is a little tougher yet I can hear ALL the strings as if one-by-one. The Led Zeppelin took me back like it should and sounded very good with probably better detail than I was expecting. I found myself pulling out a few more old favorites and was really enjoying myself. REVIEW: Although it may look like a simple little box, the Fosi BOX X1 phono preamp is a great basic preamp. Solid as a rock. It does everything you need it to do and with the extra output, even does a little more. It processes the audio signal transparently without coloration. For the super affordable price this is perfect for someone just starting in the vinyl record journey, the advanced audiophile needing a basic preamp for a second system or for testing and service purposes. PROS: Solid build Easy to use Maintains sound quality 2 Outputs Very affordable CONS: Utilitarian looks Cannot be used for Moving Coil (MC) cartridges <X1 1.jpg>

## Frequently Bought Together

- Fosi Audio Box X1 Phono Preamp for MM Turntable Mini Stereo Audio Hi-Fi Phonograph/Record Player Preamplifier with 3.5MM Headphone and RCA Output with DC 12V Power Supply
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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-03-20*