---
product_id: 218538406
title: "BOSS Audio Systems BRS40 50 Watt, 4 Inch, Full Range, Replacement Car Speaker - Sold Individually"
brand: "boss audio systems"
price: "£34.35"
currency: GBP
in_stock: true
reviews_count: 6
category: "Boss Audio Systems"
url: https://www.desertcart.co.uk/products/218538406-boss-audio-systems-brs40-50-watt-4-inch-full-range
store_origin: GB
region: United Kingdom
---

# 4 Ohms impedance 100Hz-18kHz frequency range 50W max power BOSS Audio Systems BRS40 50 Watt, 4 Inch, Full Range, Replacement Car Speaker - Sold Individually

**Brand:** boss audio systems
**Price:** £34.35
**Availability:** ✅ In Stock

## Summary

> 🎶 Upgrade your ride’s vibe with BOSS-level sound power!

## Quick Answers

- **What is this?** BOSS Audio Systems BRS40 50 Watt, 4 Inch, Full Range, Replacement Car Speaker - Sold Individually by boss audio systems
- **How much does it cost?** £34.35 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/218538406-boss-audio-systems-brs40-50-watt-4-inch-full-range)

## Best For

- boss audio systems enthusiasts

## Why This Product

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

## Key Features

- • **Powerful 50W Output:** Feel every beat with crisp, clear sound that fills your car.
- • **Wide Frequency Range:** Experience rich lows and sparkling highs from 100Hz to 18kHz.
- • **3-Year Platinum Warranty:** Drive worry-free with industry-leading coverage backing your sound upgrade.
- • **Optimized 4 Ohm Impedance:** Seamlessly integrates with most car audio systems for maximum efficiency.
- • **Durable Polypropylene Cone:** Built to last with a lightweight yet sturdy design for consistent performance.

## Overview

The BOSS Audio Systems BRS40 is a 4-inch full-range replacement car speaker delivering up to 50 watts of power. Featuring a 4 Ohm impedance and a frequency response spanning 100 Hz to 18 kHz, it ensures balanced audio performance with solid bass and clear highs. Its polypropylene cone and foam surround provide durability and sound clarity, while the 3-year platinum warranty guarantees long-term reliability. Perfect for millennial professionals seeking an affordable yet impactful audio upgrade for their vehicle.

## Description

BOSS Audio Systems BRS40 4 Inch Replacement Car Door Speaker - 50 Watts Max, Sold in Individually

Review: Good cheap speaker - Very good base for a cheap speaker very much recommend as good as a good set of speakers
Review: 音は良かった - 車に備え付けのダッシュボードスピーカーの音ががっかりだったので 同サイズのこのスピーカーが意外に格安だったので購入 低音は満足のいく音でした。高音もう少し出てくれると更に良かったのですが 良く見なかった自分が悪かったのですがペア（２個）価格かと思って購入したら １個でした。（慌てて追加購入しました(^_^;)）

## Features

- Impedance: 4 Ohms, Frequency Response: 100 Hz - 18 kHz, Sensitivity: 82 dB
- Cone: Polypropylene, Voice Coil: 1 Inch Aluminum
- Surround: Foam, Basket: Stamped
- Dimensions: Depth 4.1” x Width 4.1” x Height 1.8”, Weight Per Pair: 1 Lbs.
- 3 Year Platinum Online Dealer Warranty

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001RNNX8K |
| Age Range Description | Adult |
| Antenna Location | For music players |
| Audio Driver Type | Dynamic Driver |
| Audio Output Mode | Surround |
| Audio output mode | Surround |
| Battery Average Life | 5 Hours |
| Best Sellers Rank | 25,188 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 62 in Coaxial Car Speakers |
| Box Contents | Speaker |
| Brand | BOSS Audio Systems |
| Brand Name | BOSS Audio Systems |
| Colour | Black |
| Compatible Devices | Desktop, Karaoke Machine, Laptop, MP3 Player, Smartphone, Tablet |
| Compatible with Vehicle Type | Bus, Car, RV, Tractor, Truck, Van |
| Connectivity Protocol | USB |
| Connectivity technology | Coaxial |
| Control Method | Touch |
| Controller Type | Touch Control |
| Country of Origin | China |
| Customer Package Type | Standard Packaging |
| Customer Reviews | 4.4 out of 5 stars 1,043 Reviews |
| Enclosure Material | Polypropylene, Aluminum |
| Frequency Response | 18 KHz |
| Frequency response | 18 KHz |
| Global Trade Identification Number | 00791489110341, 00999994548769 |
| Impedance | 4 Ohms |
| Is Waterproof | False |
| Item Dimensions D x W x H | 10.3D x 10.3W x 4.6H centimetres |
| Item Weight | 0.87 Pounds |
| MP3 player | No |
| Manufacturer | BOSS Audio Systems |
| Maximum Range | 25 Metres |
| Maximum Speaker Output Power (in watts) | 50 Watts |
| Model Name | BRS40 |
| Model Number | BRS40 |
| Mounting Type | Flush Mount |
| Mounting type | Flush Mount |
| Network Connectivity Technology | Coaxial |
| Number of Audio Channels | 5.1 |
| Number of Batteries | 1 12V batteries required. |
| Number of Items | 1 |
| Power Source | Corded Electric |
| Product Features | Radio |
| Speaker Size | 4 Inches |
| Speaker Type | Component |
| Speaker maximum output power | 50 Watts |
| Specific Uses For Product | car audio systems replacement |
| Subwoofer Connectivity Technology | Wired |
| Subwoofer Speaker Diameter | 4 Inches |
| Tweeter Diameter | 4.01 Inches |
| UPC | 523161112950 999994548769 999994339039 617407313352 809186297385 328996141256 070071263581 072090792981 809385692271 100010956615 014445412151 791489110341 |
| Unit Count | 1.0 count |
| Warranty Type | Limited |
| Water Resistance Level | Not Water Resistant |
| Wireless Technology Type | No Wireless Communication Technology |
| Woofer Driver Diameter | 4 Inches |

## Product Details

- **Audio output mode:** Surround
- **Brand:** BOSS Audio Systems
- **Connectivity technology:** Coaxial
- **Frequency response:** 18 KHz
- **Material:** Polypropylene, Aluminum
- **Model name:** BRS40
- **Mounting type:** Flush Mount
- **Speaker maximum output power:** 50 Watts
- **Speaker type:** Component
- **Special feature:** Radio

## Images

![BOSS Audio Systems BRS40 50 Watt, 4 Inch, Full Range, Replacement Car Speaker - Sold Individually - Image 1](https://m.media-amazon.com/images/I/71Qu5c+NIEL.jpg)
![BOSS Audio Systems BRS40 50 Watt, 4 Inch, Full Range, Replacement Car Speaker - Sold Individually - Image 2](https://m.media-amazon.com/images/I/81dc4myOVKL.jpg)
![BOSS Audio Systems BRS40 50 Watt, 4 Inch, Full Range, Replacement Car Speaker - Sold Individually - Image 3](https://m.media-amazon.com/images/I/711nuqPvviL.jpg)
![BOSS Audio Systems BRS40 50 Watt, 4 Inch, Full Range, Replacement Car Speaker - Sold Individually - Image 4](https://m.media-amazon.com/images/I/71dgTcxKaXL.jpg)
![BOSS Audio Systems BRS40 50 Watt, 4 Inch, Full Range, Replacement Car Speaker - Sold Individually - Image 5](https://m.media-amazon.com/images/I/71U+ROx3iqL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: What is the ohm rating on these speakers?**
A: 4 ohm's

**Q: Does this fit 2011 Ram 1500 dash speaker?**
A: The only sure way to tell is to take out the old speaker and measure it. If yours is not the size of the BRS35, there are other sizes available.

**Q: is it important to use the plastic mounting ring?**
A: Not if the speaker fits without them.  I installed them in the front doors in my old Escort without them and they work fine.

**Q: Is it a pair of speakers or just one speaker?**
A: Just one at a time. So you really have to order 2 of them if you need a pair.

Sold at unit.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good cheap speaker
*by R***N on 29 June 2026*

Very good base for a cheap speaker very much recommend as good as a good set of speakers

### ⭐⭐⭐⭐⭐ 音は良かった
*by L***C on 29 January 2024*

車に備え付けのダッシュボードスピーカーの音ががっかりだったので 同サイズのこのスピーカーが意外に格安だったので購入 低音は満足のいく音でした。高音もう少し出てくれると更に良かったのですが 良く見なかった自分が悪かったのですがペア（２個）価格かと思って購入したら １個でした。（慌てて追加購入しました(^_^;)）

### ⭐⭐⭐⭐⭐ Good boom for the price
*by K***N on 3 October 2016*

For the price, which is simply incredible, these are 5-star speakers. I picked up 2 for a home stereo project (bookshelf mini-speakers). They arrived incredibly fast and were clam-shelled for extra protection. See picture below for contents. Speaker is 4" square. The leads are marked, but it is really faint; I used a flashlight to read the polarities. Speakers were tested on a Pioneer amp. At 25 watts (4 Ohm impedance) they were clear, loud, and without distortion. The bass registers but is nothing to write home about. The woofer does pick-up beautiful midranges clearly and with an audiophile level not expected for the price. It is a dual cone, so the tweeter is is a whizzer that really can't pick up the high range treble and is mediocre, but passable. The next test was at 50W - likely overdriven somewhat (~55W). Sound output was very good; loud, mostly clear and unexpectedly crisp on midrange (with limited bass) - it played a house mix with boom. Again, the treble suffered; it started to distort on treble laden rock songs (despite the amp actively filtering the signal). Despite this distortion, the speakers are surprisingly good, better than expected, and at that price... need I say more?

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**Shop now:** [https://www.desertcart.co.uk/products/218538406-boss-audio-systems-brs40-50-watt-4-inch-full-range](https://www.desertcart.co.uk/products/218538406-boss-audio-systems-brs40-50-watt-4-inch-full-range)

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-08-02*