---
product_id: 51041422
title: "Boss Audio ask904b.64 500 W 4-Channel Bluetooth Amplifier MC900B & Pair of 180 W MR6 W Marine Speakers Set"
brand: "boss audio systems"
price: "€ 1040.81"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.be/products/51041422-boss-audio-ask904b-64-500-w-4-channel-bluetooth-amplifier
store_origin: BE
region: Belgium
---

# IPX7 waterproof rating, marine-ready Bluetooth wireless streaming 500W max power, 4-channel amplifier Boss Audio ask904b.64 500 W 4-Channel Bluetooth Amplifier MC900B & Pair of 180 W MR6 W Marine Speakers Set

**Brand:** boss audio systems
**Price:** € 1040.81
**Availability:** ✅ In Stock

## Summary

> 🎶 Ride the wave of premium sound—where power meets waterproof style!

## Quick Answers

- **What is this?** Boss Audio ask904b.64 500 W 4-Channel Bluetooth Amplifier MC900B & Pair of 180 W MR6 W Marine Speakers Set by boss audio systems
- **How much does it cost?** € 1040.81 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/51041422-boss-audio-ask904b-64-500-w-4-channel-bluetooth-amplifier)

## 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

- • **Effortless Integration:** Multiple AUX and low-level inputs make installation a breeze, so you can upgrade your sound system without the hassle.
- • **Powerhouse Performance:** Unleash 500 watts of crystal-clear sound with the MC900B 4-channel amplifier, perfect for immersive audio experiences on land or sea.
- • **Marine-Grade Durability:** IPX7 waterproof rating and rugged rubber surrounds ensure your speakers withstand the harshest marine environments without missing a beat.
- • **Precision Audio Engineering:** 94W RMS per channel and 180W max per speaker deliver balanced, distortion-free sound that commands attention.
- • **Seamless Wireless Connectivity:** Stream your favorite playlists effortlessly via Bluetooth from Spotify, Pandora, or any app—ditch the cables and embrace freedom.

## Overview

The Boss Audio ASK904B.64 is a robust 4-channel Bluetooth amplifier delivering up to 500 watts max power at 4 ohms, paired with two 6.5-inch MR6W marine speakers rated at 180 watts max and 90 watts RMS per pair. Designed with IPX7 waterproofing and durable rubber surrounds, this set is engineered for both marine and land use, offering wireless music streaming and versatile input options for seamless connectivity and installation.

## Description

The 500 watt 4-channel Bluetooth amplifier package delivers clear sound, while the rubber surround ensures smooth resonance and durability. This set includes the Boss Audio Mc900B amplifier as well as a pair of Mr6W 6.5 inch speakers with poly carbon membrane and a rubber surround. The 4-ohm stable amplifier has 500 watts of power with a Mosfet power supply, ideal for water and land.

Review: Good sound, easy installation.
Review: Exelente producto lo recomiendo se lo puse a una Road king y se escucha muy bien

## Features

- 4-channel amplifier MC900B 500 Watt Max Power at 4 Ω, RMS Power @ 4 Ohm, 4x 94 W Class A/B amplifier
- Speaker Set MR6 W 180 watt max 90 Watt RMS Power per pair
- Multifunction Bedienung
- AUX/Low Level Inputs
- Wireless Playback of music and apps such as Spotify, Pandora

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00VFZ09TG |
| Brand | BOSS Audio Systems |
| Customer Reviews | 4.4 4.4 out of 5 stars (619) |
| Global Trade Identification Number | 00791489123020 |
| Item Dimensions | 19.1 x 13.5 x 4.3 centimetres |
| Item Type Name | Boss Audio 500 Watt 4-Channel Bluetooth Amplifier MC900B and Two Pairs of 180 Watt MR6W Marine Speakers in Set |
| Item Weight | 4.54 kg |
| Manufacturer | BOSS AUDIO |
| Material | Plastic, weather-resistant material |
| Maximum Supply Voltage | 12 Volts (DC) |
| Minimum Supply Voltage | 12 Volts |
| Model Number | ASK904B.64 |
| Mounting Type | Tabletop |
| Number of Channels | 4 |
| Output Power | 500 Watts |
| Package Type Name | Box |
| Specification Met | IPX7 |
| UPC | 791489123020 |
| Voltage | 12 Volts |

## Product Details

- **Item dimensions L x W x H:** 19.1 x 13.5 x 4.3 centimetres
- **Manufacturer:** BOSS AUDIO
- **Maximum supply voltage:** 12 Volts (DC)
- **Minimum supply voltage:** 12 Volts
- **Voltage:** 12 Volts

## Images

![Boss Audio ask904b.64 500 W 4-Channel Bluetooth Amplifier MC900B & Pair of 180 W MR6 W Marine Speakers Set - Image 1](https://m.media-amazon.com/images/I/81-CElty91L.jpg)
![Boss Audio ask904b.64 500 W 4-Channel Bluetooth Amplifier MC900B & Pair of 180 W MR6 W Marine Speakers Set - Image 2](https://m.media-amazon.com/images/I/A1W8ynU53sL.jpg)
![Boss Audio ask904b.64 500 W 4-Channel Bluetooth Amplifier MC900B & Pair of 180 W MR6 W Marine Speakers Set - Image 3](https://m.media-amazon.com/images/I/81kaZxPmKRL.jpg)
![Boss Audio ask904b.64 500 W 4-Channel Bluetooth Amplifier MC900B & Pair of 180 W MR6 W Marine Speakers Set - Image 4](https://m.media-amazon.com/images/I/81MSq4tVymL.jpg)
![Boss Audio ask904b.64 500 W 4-Channel Bluetooth Amplifier MC900B & Pair of 180 W MR6 W Marine Speakers Set - Image 5](https://m.media-amazon.com/images/I/71dNjeh8sgL.jpg)

## Questions & Answers

**Q: I hooked this system up in my boat. It works great until i turn the boat motor on. Then it cuts in and out continuously. Ideas what might be wrong**
A: I’m having the exact same problem. With te engine off it works just fine but ad soon as I turn the engine on in cuts and turns off. 

I made a completely separate cable and connection straight from the battery and the problem persists. 

I have a voltage gauge and volts go from 12.6 with the engine off to 14.4 with te engine on which is just fine.

I even changed the voltage rectifier in my engine but the problem persists. 

Its definitely a problem with the amp.

**Q: If i install this without a head unit can i control the fade and balance with the inline multi-function remote?**
A: Not as far as I know !

**Q: What is the rms of the speakers?**
A: 10

**Q: Will the unit still work from a smart phone if the remote gets lost or broken.**
A: The remote is hardwired, if you lose it will not function

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by R***M on 26 February 2026*

Good sound, easy installation.

### ⭐⭐⭐⭐⭐ Review
*by K***. on 15 May 2021*

Exelente producto lo recomiendo se lo puse a una Road king y se escucha muy bien

### ⭐⭐⭐⭐⭐ Review
*by B***S on 5 August 2021*

After evaluating many options on the market, I bought this amplifier, read many reviews, and compare different options. I chose this one because it already had the speakers included. It is not easy to choose the right speaker for an amplifier since the amplifiers have RMS and nominal power, which changes if the speaker is 4 or 8. It is not easy to choose the right speaker, so I thought it was very good that already the amplifier will bring the speakers. Less task to acquire the whole set. I was surprised by the size of the amp. It is really small. I thought the sound would not be that good, but I was wrong. The sound surprised me! It is very good! My boat is a 21-foot bowrider type and with the engine running the old audio system just couldn't be heard, so I decided to change it for a better system, and this one works well. Pros: - The small size of the amp really makes it easy to hide it inside the boat - Bluetooth connection is extremely easy - The controls screen facilitates everything - It is a totally marine product - The speakers are easy to install and have the patterns to make the holes. - The USB connector is very good. Read MP3. - It is a very practical system and the sound is very good. Now my friends call it "the party boat" :) - the price is right. Cons - I don't have any for now.

## Frequently Bought Together

- BOSS Audio Systems ASK904B.64 Marine Boat 6.5 inch Speakers and 4 Channel Amplifier - 500 High Output, Bluetooth Remote, USB and Auxiliary, Waterproof Pouch
- FXC Waterproof Marine Boat Rocker Switch Aluminum Panel 5 Gang with Dual USB Slot Socket 3.1A + Volt Meter Blue LED Light for Car Rv Vehicles Truck (KG0149-5B Blue)
- 10 Gauge Marine Wire,10 AWG 30ft Duplex Marine Grade Wire Tinned Copper Oxygen-Free Insulated Red& Black Electrical Cable for Boat/Automotive/RV/Camper/Trailer

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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-04-22*