---
product_id: 2391526
title: "BOSS Audio Systems BRS40 4 Inch Replacement Car Door Speaker - 50 Watts Max, Sold in Individually"
brand: "boss audio systems"
price: "S$39"
currency: SGD
in_stock: true
reviews_count: 13
category: "Boss Audio Systems"
url: https://www.desertcart.sg/products/2391526-boss-audio-systems-brs40-4-inch-replacement-car-door-speaker
store_origin: SG
region: Singapore
---

# 100Hz-18kHz frequency range 4-inch driver size 50W max power BOSS Audio Systems BRS40 4 Inch Replacement Car Door Speaker - 50 Watts Max, Sold in Individually

**Brand:** boss audio systems
**Price:** S$39
**Availability:** ✅ In Stock

## Summary

> 🔊 Upgrade your ride’s soundtrack with BOSS-level clarity!

## Quick Answers

- **What is this?** BOSS Audio Systems BRS40 4 Inch Replacement Car Door Speaker - 50 Watts Max, Sold in Individually by boss audio systems
- **How much does it cost?** S$39 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/2391526-boss-audio-systems-brs40-4-inch-replacement-car-door-speaker)

## 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

- • **Wide Frequency Range:** Experience rich lows and crisp highs from 100Hz to 18kHz.
- • **Compact 4-Inch Design:** Perfect fit for seamless door replacement without hassle.
- • **Powerful 50W Max Output:** Feel every beat with crystal-clear sound that fills your car.
- • **3-Year Platinum Warranty:** Confidence backed by BOSS Audio’s trusted reliability.
- • **Durable Polypropylene Cone:** Engineered for long-lasting performance and minimal distortion.

## Overview

The BOSS Audio Systems BRS40 is a 4-inch replacement car door speaker delivering up to 50 watts max power with a 4-ohm impedance. Featuring a polypropylene cone and foam surround, it offers a frequency response from 100Hz to 18kHz and 82 dB sensitivity for clear, dynamic sound. Compact and easy to install, it comes with a 3-year platinum warranty, making it a reliable upgrade for any vehicle audio system.

## Description

Product description Speakers 4" Car Replacement Speakers - 50 Watts Of Power, Sold in Individually BRS40 Before making your purchase, find out what type of speakers you will be replacing. You can simply measure the existing speakers and go from there. If you do not have any to begin with, a local Audio/Video shop can guide you with a few simple questions about your vehicle. Most of the time you will be able to drop them right in with little to no alterations needed. Pay close attention to the RMS power handling of the speakers you are purchasing. This is the continuous power that a speaker can handle without distorting. Your head unit will have to have the proper number of speaker outputs compared to how many speakers you plan to hook up to it, as well as sufficient power from the built-in amplifier. Sometimes though, a separate or external amplifier will have to be employed so that your speakers get the adequate power they need for optimal performance. • Full Range 4" Speaker Single • 50 Watts MAX 25 Watts RMS Power Handling • 100 Hz to 18 kHz Frequency Response and 82dB Sensitivity • Polypropylene Woofer Cone and Foam Surround • Sold Individually Features Poly Injection Cone Polypropylene is a resilient and durable manufactured material. It allows for maximum flexibility that produces great sounding speakers. Foam Surround Foam is a great material for surrounds in speakers and subwoofers. It is in general more flexible than rubber, providing a slightly higher efficiency. This also translates to better excursion. (How far the cone of a speaker linearly travels from its resting position). It generally lasts anywhere from 8 to 15 years under the right conditions of usage Stamped Basked Stamped baskets have better Resonant Frequencies. This means that the frame is able to absorb and transfer much of the energy produced by the speaker. It is more durable and harder to damage or break, good corrosion resistance, high thermal/electrical conductivity and retains strength at high temperatures High Temperature Voice Coil Our speakers are capable of higher or elevated temperature strength and fatigue properties that will increase performance and efficiency of heavy duty play time through lower weight and higher operating temperatures

Review: Great sound - Great speaker love the sound great price will get more for my other truck when ready
Review: Good quality, perfect sound - Good quality, perfect sound

## Features

- Dimensions: 4.06 x 4.06 x 1.80 inches
- Impedance: 4 ohms
- Item Weight: 0.87 Lbs.
- Mounting Depth: 1.75 inches, Mounting Hole: 4.01 inches
- Frequency Response: 100 Hz to 18 KHz
- Sensitivity: 82 dB @ 1 watt/1 meter
- Polypropylene Cone, Foam Surround
- Stamped Basket, 0.77 Inch Voice Coil
- BOSS Audio Systems provides a powerful 3-year platinum online dealer warranty. We strongly encourage professional installation of this product to ensure proper and safe functionality

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001RNNX8K |
| Additional Features | Radio |
| Age Range Description | Adult |
| Antenna Location | car |
| Audio Driver Type | Dynamic Driver |
| Audio Output Mode | Stereo |
| Best Sellers Rank | #9,455 in Electronics ( See Top 100 in Electronics ) #55 in Car Coaxial Speakers |
| Brand | BOSS Audio Systems |
| Built-In Media | Speaker |
| Color | black |
| Compatible Devices | Desktop, Karaoke Machine, Laptop, MP3 Player, Smartphone, Tablet |
| Compatible with Vehicle Type | Bus, Car, RV, Tractor, Truck, Van |
| Connectivity Protocol | Coaxial |
| Connectivity Technology | Coaxial |
| Control Method | Touch |
| Customer Package Type | Standard Packaging |
| Customer Reviews | 4.2 out of 5 stars 5,017 Reviews |
| Enclosure Material | Polypropylene, Aluminum |
| Frequency Response | 18 KHz |
| Global Trade Identification Number | 00791489110341, 00999994548769 |
| Impedance | 4 Ohms |
| Is Waterproof | False |
| Item Dimensions D x W x H | 4.06"D x 4.06"W x 1.8"H |
| Item Weight | 0.87 Pounds |
| MP3 player | No |
| Manufacturer | BOSS Audio Systems |
| Maximum Range | 25 Meters |
| Model Name | BRS40 |
| Model Number | BRS40 |
| Mounting Type | Flush Mount |
| Number of Audio Channels | 4.1 |
| Number of Batteries | 1 12V batteries required. |
| Number of Items | 1 |
| Power Source | Corded Electric |
| Speaker Maximum Output Power | 50 Watts |
| Speaker Size | 4 Inches |
| Speaker Type | Coaxial |
| Specific Uses For Product | car audio systems replacement |
| Subwoofer Connectivity Technology | Wired |
| Subwoofer 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 Description | 3 YEAR PLATINUM DEALER WARRANTY |
| Warranty Type | Extended |
| Water Resistance Level | Not Water Resistant |
| Woofer Diameter | 4 Inches |

## Product Details

- **Audio Output Mode:** Stereo
- **Brand:** BOSS Audio Systems
- **Connectivity Technology:** Coaxial
- **Mounting Type:** Flush Mount
- **Speaker Maximum Output Power:** 50 Watts

## Images

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

### ⭐⭐⭐⭐⭐ Great sound
*by G***R on May 4, 2026*

Great speaker love the sound great price will get more for my other truck when ready

### ⭐⭐⭐⭐⭐ Good quality, perfect sound
*by T***R on May 5, 2026*

Good quality, perfect sound

### ⭐⭐⭐⭐ Works as Replacement for Job Rocker Max
*by M***R on August 18, 2018*

I used this 6.5” speaker as a replacement for the speaker from my Job Rocker Max with a minor modification. This speaker is about an inch less in diameter (I forget exactly). It still will seat in the cabinet, but the outer frame cannot reach to the screw holes to mount the speaker. I used those plastic mirror holder clips (normally used to mount a full length mirror to a door). Then I went to Home Depot to get longer screws (1”) to be able to reach through the plastic clip. I think I used six, but four would probably work. So $13 for the speaker and another $5 for mirror clips and screws and the unit is back in business. This assumes you already have a soldering gun to disconnect and reconnect the new speaker. The performance is similar to the old speaker. It seems to have a little less bass response, perhaps owing to the smaller size. The units are not about high fidelity, but rather portable music or amplification. I was glad I was able to save the unit for under $20. It probably took me more than an hour taking it apart and going for parts, etc., but I would have hated to just throw it away when I know it could be fixed. I looked at ION’s website for replacement parts. I could not find it. There was a phone number, but my guess was that this would be a hassle and more expensive. Maybe I was wrong, but how hard is it to list the speaker for order. I don’t know if my rating is fair. The speaker sounds like the cheap speaker it replaced. But that is a great value for $13. If you are going to be real picky about the sound, you shouldn’t be buying $13 speakers.

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-05-16*