---
product_id: 561896532
title: "Fosi Audio Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp"
brand: "fosi audio"
price: "30048 som"
currency: KGS
in_stock: true
reviews_count: 7
category: "Fosi Audio"
url: https://www.desertcart.kg/products/561896532-fosi-audio-box-x4-phono-preamp-and-headphone-amplifier-jan
store_origin: KG
region: Kyrgyzstan
---

# 3.5mm AUX headphone output Replaceable JAN 5654W vacuum tubes RCA output for versatile connectivity Fosi Audio Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp

**Brand:** fosi audio
**Price:** 30048 som
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your vinyl game with tube-powered precision!

## Quick Answers

- **What is this?** Fosi Audio Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp by fosi audio
- **How much does it cost?** 30048 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/561896532-fosi-audio-box-x4-phono-preamp-and-headphone-amplifier-jan)

## 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

- • **Compact Powerhouse:** Sleek design packs high-fidelity performance into a space-saving chassis.
- • **Customizable Tube Tone:** Swap vacuum tubes to tailor your sound signature—your vinyl, your vibe.
- • **Next-Gen Sound Mastery:** Experience pristine, tube-enhanced audio clarity that elevates every vinyl spin.
- • **Dual Output Flexibility:** Seamlessly switch between RCA and headphone outputs for ultimate listening freedom.
- • **Confidence in Every Note:** Backed by a 24-month warranty and dedicated customer support for worry-free listening.

## Overview

The Fosi Audio Box X4 is a compact, next-generation phono preamp and headphone amplifier featuring replaceable JAN 5654W vacuum tubes for customizable sound. It supports both 3.5mm AUX headphone and RCA outputs, delivering versatile connectivity and high-fidelity audio tailored for MM turntables. Designed for audiophiles seeking premium tube warmth and control, it includes bass, treble, and volume adjustments, backed by a 24-month warranty and responsive customer service.

## Description

2022 NEW MODEL: The updated version for BOX X2. Next-generation phono preamp for unrivaled sound quality.

Review: Nice product - Nice product
Review: Bad - It’s so bad makes the sound quality disastrous

## Features

- The updated version for BOX X2. Next-generation phone preamp for unparalleled sound quality.
- Tube Headphone Amplifier & Preamp: The BOX X4 is designed with a 3.5MM AUX headphone and RCA output, very useful beyond imagination.
- Applicable Vacuum Tubes Model: 6K4/6J1/6J4/GE5654/6AK5/66*In vacuum tubes, etc. You can replace the vacuum tubes to DIY your stereo. Different tubes with different sounds.
- What you get: BOX X4 phono preamp, DC 12V power supply, manual, our worry-free 24-month warranty, and friendly customer service.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07L4TMHRN |
| Best Sellers Rank | #24,403 in Electronics ( See Top 100 in Electronics ) #3 in Home Audio Phono Preamplifiers |
| Item model number | BOX X4 |
| Manufacturer | Fosi Audio |
| Product Dimensions | 10.16 x 5.08 x 2.54 cm; 362.87 g |

## Product Details

- **Item dimensions L x W x H:** 10.2 x 5.1 x 2.5 centimeters
- **Manufacturer:** Fosi Audio
- **Maximum supply voltage:** 12 Volts (DC)
- **Minimum supply voltage:** 12 Volts (DC)
- **Voltage:** 12 Volts (DC)

## Images

![Fosi Audio Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp - Image 1](https://m.media-amazon.com/images/I/61W0YonYLBL.jpg)

## Questions & Answers

**Q: I have the pyle turntable and fosi audio tb10a amp but the sound is very low, so i need to add this phono preamp to amplify sound?**
A: Yes, you need connect this phono preamp between the turntable and tb10a amp, it will amplify the sound also improve the sound quality.
Thanks.

**Q: Can I directly connect this phono preamp to the speakers?**
A: If your speakers are powered speakers, you can directly connect this preamp to the speakers. 
But you need add an amplifier or receiver to the passive speakers.
Thanks.

**Q: Does this work best with Ceramic or Magnetic stylii? Can it do both?**
A: As long as your cartridge can output a voltage between ~2.0 -5 0 millivolts, the Fosi Audio Box X4 should work.  Amazon cells ceramic cartridges around $10, that I want to experiment with one.  Thanks for your question.

**Q: Why would an upgraded model have an snr of 70db and the older version is at 98db? seems like a downgrade. are those specs correct?**
A: I have a feeling that either this measurement is incorrect or the previous model's measurement is wrong. There is not enough information in either measurement; how did they do it? What kind of signal was used? What frequency? Was this measured with or without a signal going into it? Was it measured while playing an actual track off vinyl, or dead wax? Did the SNR change if you engaged the EQ? 

Even if the previous model gave you 98dB, it's impossible to reach that measurement with vinyl — even the cleanest, best vinyl ever made while using the most expensive, best stylus, cartridge, preamp, etc. isn't going to give you anything better than ~70dB. The X4 specs state ≥ 70dB which means at the very least it will give you 70dB or above. 

Having said all that, I think the X4 sounds great, especially for the price!

## Customer Reviews

### ⭐⭐⭐⭐ Nice product
*by A***. on 14 September 2024*

Nice product

### ⭐ Bad
*by A***D on 29 March 2025*

It’s so bad makes the sound quality disastrous

### ⭐⭐⭐⭐⭐ Review
*by I***N on 28 August 2025*

Just what I was looking for. I have an MM phono turntable (not amplified) and wanted to listen to vinyls with my headphones. The product has a solid feel with smooth controls. The volume, treble and bass controls really help. Good value.

## Frequently Bought Together

- Fosi Audio Box X4 Phono Preamp with JAN 5725W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control
- Monoprice 1.5ft Premium 2 RCA Plug/2 RCA Plug M/M 22AWG Cable - Black
- 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.kg/products/561896532-fosi-audio-box-x4-phono-preamp-and-headphone-amplifier-jan](https://www.desertcart.kg/products/561896532-fosi-audio-box-x4-phono-preamp-and-headphone-amplifier-jan)

---

*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-02-06*