---
product_id: 94770582
title: "Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version"
brand: "little bear"
price: "4370.91 DT"
currency: TND
in_stock: true
category: "Little Bear"
url: https://www.desertcart.tn/products/94770582-little-bear-b4-x-portable-dual-mono-vacuum-tube-headphone
store_origin: TN
region: Tunisia
---

# 300Ω headphone support Dual-mono balanced Rechargeable battery Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version

**Brand:** little bear
**Price:** 4370.91 DT
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate Your Sound Game with the Little Bear B4-X!

## Quick Answers

- **What is this?** Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version by little bear
- **How much does it cost?** 4370.91 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/94770582-little-bear-b4-x-portable-dual-mono-vacuum-tube-headphone)

## Best For

- little bear enthusiasts

## Why This Product

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

## Key Features

- • **Premium Build Quality:** Crafted with gold-plated sockets and high-end components for superior durability.
- • **Versatile Connectivity:** Compatible with both 3.5mm and 2.5mm outputs for all your headphone needs.
- • **Portable HiFi Experience:** Take your music anywhere with a compact design that fits in your hand.
- • **Smart Battery Management:** Enjoy uninterrupted listening with built-in battery protection and automatic shut-off.
- • **Unmatched Sound Separation:** Experience audio like never before with independent amplification for each channel.

## Overview

The Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier is a high-performance audio device designed for audiophiles on the go. Featuring independent amplification for enhanced sound separation, a compact design for portability, and compatibility with various headphone outputs, this amplifier ensures a premium listening experience. With its high-quality materials and smart battery management, the B4-X is perfect for those who demand both quality and convenience in their audio gear.

## Description

Buy Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07KJ18H75 |
| Best Sellers Rank | #405,750 in Electronics ( See Top 100 in Electronics ) #500 in Headphone Amps |
| Brand | Little Bear |
| Brand Name | Little Bear |
| Color | Black |
| Compatible Devices | 3.5mm Audio Output Devices |
| Control Type | Button Control |
| Customer Reviews | 4.0 out of 5 stars 198 Reviews |
| Fit Type | body-worn |
| Headphone Folding Features | External/Standalone |
| Item Dimensions L x W | 4.5"L x 2.7"W |
| Item Weight | 245 g |
| Lithium Battery Voltage | 12 volts |
| Lithium Battery Weight | 32.6 g |
| Model Name | Little Bear B4-X |
| Model Number | 7545884688 |
| Noise Control | None |
| Number of Items | 1 |
| Outer Material | Gold-plated |
| Output Wattage | 0.45 watts |
| Part Number | JMQ413_H |
| Power Source | Battery Powered |
| Product Style | Neck-worn |
| Recommended Uses For Product | personal audio enhancement |
| Software Update Supported to Date | unknown |
| Special Feature | Portable |
| Special Features | Portable |
| Strap Type | Clip/Lanyard |
| Style | Neck-worn |

## Product Details

- **Brand:** Little Bear
- **Color:** Black
- **Model Name:** Little Bear B4-X
- **Power Source:** Battery Powered
- **Style:** Neck-worn

## Images

![Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version - Image 1](https://m.media-amazon.com/images/I/71NgP4S28HL.jpg)
![Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version - Image 2](https://m.media-amazon.com/images/I/71iR4k88a1L.jpg)
![Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version - Image 3](https://m.media-amazon.com/images/I/713YafzsNaL.jpg)
![Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version - Image 4](https://m.media-amazon.com/images/I/71WGaUkxSJL.jpg)
![Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Upgrade Version - Image 5](https://m.media-amazon.com/images/I/71OoX1HF79L.jpg)

## Questions & Answers

**Q: Why mine which is brand new stopped working and makes a loud hissing/banging noise?**
A: Charge it. It’s just outta power

**Q: Does this B4-X works while charging? without any limiter like "for safety reason"**
A: Hello. Sorry B4-X still has the limitation.

**Q: best place to buy op amps**
A: Amazon.

**Q: Mine stopped holding a charge, can the batteries be replaced?**
A: Yes you can, easy todo

## Frequently Bought Together

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**Shop now:** [https://www.desertcart.tn/products/94770582-little-bear-b4-x-portable-dual-mono-vacuum-tube-headphone](https://www.desertcart.tn/products/94770582-little-bear-b4-x-portable-dual-mono-vacuum-tube-headphone)

---

*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-10-09*