---
product_id: 75076969
title: "Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine"
brand: "gravity audio"
price: "£5.29"
currency: GBP
in_stock: false
reviews_count: 8
url: https://www.desertcart.co.uk/products/75076969-gravity-gbr300-4dm-true-600-watt-rms-micro-ultra-compact
store_origin: GB
region: United Kingdom
---

# Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine

**Brand:** gravity audio
**Price:** £5.29
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine by gravity audio
- **How much does it cost?** £5.29 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/75076969-gravity-gbr300-4dm-true-600-watt-rms-micro-ultra-compact)

## Best For

- gravity audio enthusiasts

## Why This Product

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

## Description

Buy Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine: Multichannel Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great amp for the boat and doesn't need a bunch of space. - This little amp punches well above its limits. Installed in my boat and was amazed at how well it pumps the sound out. I actually had to turn down the gain so my speakers didn't get destroyed. Its been in the boat for a year now, works great and amps like a amp should. Only advice, don't overtighten the little plastic cover, you'll rack or break it and have be sad like i was. Value for money: For sure Size: Small for the sound it puts out.
Review: Good for the UTV - Fast Ship, quality product

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07DVY9VB3 |
| Best Sellers Rank | #264,154 in Electronics ( See Top 100 in Electronics ) #616 in Car Multichannel Amplifiers |
| Brand | Gravity Audio |
| Brand Name | Gravity Audio |
| Customer Reviews | 4.0 out of 5 stars 49 Reviews |
| Item Dimensions | 1.5 x 4.25 x 9.5 inches |
| Item Weight | 3 Pounds |
| Item dimensions L x W x H | 1.5 x 4.25 x 9.5 inches |
| Manufacturer | Gravity Audio |
| Material Type | Plastic, Rubber |
| Maximum Supply Voltage | 3 Volts (DC) |
| Model | GBR300-4DM |
| Mounting Type | Surface Mount |
| Number of Channels | 4 |
| Output Power | 600 Watts |
| Package Type Name | Retail Box |
| Part Number | GBR300-4DM |
| UPC | 704129655454 |
| Voltage | 3 Volts |

## Product Details

- **Item dimensions L x W x H:** 1.5 x 4.25 x 9.5 inches
- **Voltage:** 3 Volts
- **Manufacturer:** Gravity Audio
- **Maximum Supply Voltage:** 3 Volts (DC)
- **Mounting Type:** Surface Mount

## Images

![Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine - Image 1](https://m.media-amazon.com/images/I/61yOM1KcbXL.jpg)
![Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine - Image 2](https://m.media-amazon.com/images/I/71xqRN1AocL.jpg)
![Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine - Image 3](https://m.media-amazon.com/images/I/71Ay1RI2L8L.jpg)
![Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine - Image 4](https://m.media-amazon.com/images/I/61I8+bqV5iL.jpg)
![Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine - Image 5](https://m.media-amazon.com/images/I/71GmJbjRPVL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great amp for the boat and doesn't need a bunch of space.
*by M***Z on June 23, 2025*

This little amp punches well above its limits. Installed in my boat and was amazed at how well it pumps the sound out. I actually had to turn down the gain so my speakers didn't get destroyed. Its been in the boat for a year now, works great and amps like a amp should. Only advice, don't overtighten the little plastic cover, you'll rack or break it and have be sad like i was. Value for money: For sure Size: Small for the sound it puts out.

### ⭐⭐⭐⭐⭐ Good for the UTV
*by A***S on July 17, 2025*

Fast Ship, quality product

### ⭐ Garbage DOA
*by B***. on July 13, 2024*

Amp is very poor quality. ZERO output for rear channel, verified input signal, but no output the rears. Now I have to wait TEN DAYS for a replacement and a ripped apart bike. Trash… GOT THE REPLACEMENT and guess what?!!!? It’s GARBAGE too! This has adjustment pots that are broken, unstable output and the gain settings drift. This was made by idiots and intended to scam customers. STAY AWAY from this absolutely poorly made trash

## Frequently Bought Together

- Gravity GBR300.4DM True 600-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier with RCA Stereo Input - IPX65 Waterproof - Perfect for Motorcycle, RV, ATV, Car, Boat, Marine
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**Shop now:** [https://www.desertcart.co.uk/products/75076969-gravity-gbr300-4dm-true-600-watt-rms-micro-ultra-compact](https://www.desertcart.co.uk/products/75076969-gravity-gbr300-4dm-true-600-watt-rms-micro-ultra-compact)

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-06-16*