---
product_id: 2391526
title: "BRS40 4 Inch Replacement Car Door Speaker, 50 Watts"
brand: "boss audio systems"
price: "₨21835"
currency: LKR
in_stock: true
reviews_count: 13
category: "Boss Audio Systems"
url: https://www.desertcart.lk/products/2391526-brs40-4-inch-replacement-car-door-speaker-50-watts
store_origin: LK
region: Sri Lanka
---

# 100Hz-18kHz frequency range 4-inch coaxial speaker size 50W max output power BRS40 4 Inch Replacement Car Door Speaker, 50 Watts

**Brand:** boss audio systems
**Price:** ₨21835
**Availability:** ✅ In Stock

## Summary

> 🎶 Upgrade your ride’s soundtrack with BOSS-level power and precision!

## Quick Answers

- **What is this?** BRS40 4 Inch Replacement Car Door Speaker, 50 Watts by boss audio systems
- **How much does it cost?** ₨21835 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/2391526-brs40-4-inch-replacement-car-door-speaker-50-watts)

## 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

- • **Perfect 4-Inch Fit:** Designed for seamless replacement with a compact 4.06-inch diameter and 1.75-inch mounting depth.
- • **Wide Frequency Range:** Enjoy balanced highs and lows from 100 Hz to 18 kHz for a full-spectrum listening experience.
- • **3-Year Platinum Warranty:** Drive worry-free with a trusted extended warranty backed by BOSS Audio Systems.
- • **Powerful 50 Watts Output:** Experience crisp, distortion-free sound that fills your car with rich audio.
- • **Durable Build with Polypropylene Cone:** Engineered for longevity and clear sound with a foam surround and stamped basket.

## Overview

The BOSS Audio Systems BRS40 is a 4-inch coaxial car door speaker delivering up to 50 watts of power with a frequency response spanning 100 Hz to 18 kHz. Its compact design ensures easy installation with a 1.75-inch mounting depth, while the polypropylene cone and foam surround provide durable, high-quality sound. Backed by a 3-year platinum warranty, this speaker is a reliable upgrade for any vehicle audio system.

## Description

desertcart.com: BOSS Audio Systems BRS40 4 Inch Replacement Car Door Speaker, 50 Watts : Electronics

Review: work just fine - Clearly these are not intended to be audiophile quality speakers. But they seem well constructed and work well for my application, as OEM-replacement rear fill speakers. I'm using them behind the seats in my BMW Z3 -- even though they are full-range, they're being driven only in a mid-range capacity by the OEM H-K amp. I'm pleased.
Review: Great replacement - Have an old under cabinet radio that needed a new. Speaker it matched what I needed for it. Some slight modification to modernize it for a better newer speaker. It works well sounds good for me when listening to my music. Just so long as you're not expecting super bass or anything it actually has a good sound for a smaller speaker. And for the price it does the job I needed it to do.

## 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 | #9,022 in Electronics ( See Top 100 in Electronics ) #27 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 | 4.4 out of 5 stars 1,100 Reviews |
| Enclosure Material | Plastic Or Metal |
| Frequency Response | 18 KHz |
| Global Trade Identification Number | 00791489110341, 00999994548769 |
| Impedance | 4 ohm |
| Is Waterproof | False |
| Item Dimensions D x W x H | 4.06"D x 4.06"W x 1.8"H |
| Item Weight | 13.92 ounces |
| 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 |
| Subwoofer Connectivity Technology | Wired |
| Subwoofer Diameter | 4 inches |
| Tweeter Diameter | 4.01 inches |
| UPC | 523161112950 999994548769 999994339039 617407313352 809186297385 328996141256 070071263581 809385692271 072090792981 100010956615 014445412151 791489110341 |
| Unit Count | 1 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
- **Frequency Response:** 18 KHz
- **Speaker Maximum Output Power:** 50 watts

## Images

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

### ⭐⭐⭐⭐⭐ work just fine
*by D***N on June 4, 2026*

Clearly these are not intended to be audiophile quality speakers. But they seem well constructed and work well for my application, as OEM-replacement rear fill speakers. I'm using them behind the seats in my BMW Z3 -- even though they are full-range, they're being driven only in a mid-range capacity by the OEM H-K amp. I'm pleased.

### ⭐⭐⭐⭐⭐ Great replacement
*by S***8 on November 7, 2024*

Have an old under cabinet radio that needed a new. Speaker it matched what I needed for it. Some slight modification to modernize it for a better newer speaker. It works well sounds good for me when listening to my music. Just so long as you're not expecting super bass or anything it actually has a good sound for a smaller speaker. And for the price it does the job I needed it to do.

### ⭐⭐⭐⭐ Medusa turned joe from family guy into stone
*by A***S on May 28, 2026*

I bought two of them and one came with coil rub the other was fine but i really like the sound quality it's a good product for the price but easy install with the plates that come with it and it seems relatively reliable I can say it was hard to find a clamp for the wires altogether I'd recommend

## Frequently Bought Together

- BOSS Audio Systems BRS40 50 Watt, 4 Inch , Full Range, Replacement Car Speaker - Sold Individually
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**Shop now:** [https://www.desertcart.lk/products/2391526-brs40-4-inch-replacement-car-door-speaker-50-watts](https://www.desertcart.lk/products/2391526-brs40-4-inch-replacement-car-door-speaker-50-watts)

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-10-09*