---
product_id: 16543816
title: "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"
brand: "boss audio systems"
price: "R$4184"
currency: BRL
in_stock: true
reviews_count: 5
url: https://www.desertcart.com.br/products/16543816-boss-audio-systems-ask904b-64-marine-boat-6-5-inch
store_origin: BR
region: Brazil
---

# IPX7 waterproof rating Built-in Bluetooth with remote 500W max power x4 channels 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

**Brand:** boss audio systems
**Price:** R$4184
**Availability:** ✅ In Stock

## Summary

> 🚤 Ride the waves with sound that commands attention!

## Quick Answers

- **What is this?** 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 by boss audio systems
- **How much does it cost?** R$4184 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/16543816-boss-audio-systems-ask904b-64-marine-boat-6-5-inch)

## 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

- • **Compact & Professional:** Sleek 7.8” x 3.8” x 1.8” amplifier and 6.5” speakers fit flush for a clean, modern installation that impresses.
- • **Powerhouse Performance:** Unleash 500 watts of crystal-clear sound across 4 channels for an immersive marine audio experience.
- • **Versatile Connectivity:** USB charging port and auxiliary input keep your devices powered and your music flowing without interruption.
- • **Weatherproof Durability:** IPX7-rated waterproof design ensures your audio system thrives even in splashy, unpredictable marine conditions.
- • **Seamless Bluetooth Streaming:** Cut the cords—control your playlist effortlessly with the included Bluetooth remote and stream from Spotify or Pandora.

## Overview

The BOSS Audio Systems ASK904B.64 is a marine-grade audio solution featuring a 500W max 4-channel Class A/B amplifier paired with 6.5-inch waterproof speakers. Designed for durability with an IPX7 rating, it offers wireless Bluetooth streaming controlled via remote, USB charging, and auxiliary inputs. Perfect for boaters seeking powerful, weather-resistant sound with professional-grade installation ease.

## Description

Pump out the jams on your next adventure with the Boss Audio ASK904B.64 4-Channel Weatherproof All-Terrain Speaker and Amplifier package. This combo kit includes the MC900B Amplifier and 2-Pairs of MR6W 6.5" Full Range Marine Speakers with Poly Carbon Cone and Rubber Surround. The 4-Ohm stable Amplifier features 500 Watts Max Power with a MOSFET power supply to rock out on land or water. Plug into the MUSB35 USB to Aux Adapter to charge and play your USB-connected smartphone or other device. Bluetooth Audio Streaming lets you play your favorite music apps like Pandora or Spotify through the speakers. No need for an In-Dash Head Unit to play your music. Control it all with the Inline Multi-Function Remote Control. The ASK904B.64 Amplifier features weatherproof connectors to prevent corrosion and provide protection against the elements. Get out and go with the Boss Audio ASK904B.64. For further product details, please scroll down.

## Features

- Amplifier Power - 500 Max x 4 @4-Ohms. USB charging port available. 4-8 Ohm Stable with RCA Outputs
- Bluetooth - You do not need a head unit. Just power up the amplifier and hook up some speakers to it. The included Bluetooth remote control lets you stream your music via your Bluetooth device and use apps like Spotify and Pandora
- Weather Resistant - The MC900B has been designed to handle some light weather conditions without giving up on you
- Class A/B Topology - Class ‘A’ amplifiers have enormous amount of current flowing through its output transistors with no audio signal. Class ‘B’ amplifiers have no current flowing through its outputs with no audio signal
- Full Range - With a Full Range amplifier you not only have the option to run your speakers, but also your subwoofers
- Auxiliary - The Bluetooth remote is compatible with the audio output from smartphones as well as MP3 players. Just plug in and start playing
- Amp Specs - Dimensions: 7.8” x 3.8” x 1.8”, Weight 2.9 lbs.
- Speaker Specs - Power: 180 watts per pair, Frequency: 80 Hz to 20 kHz, Sensitivity: 89 dB, Cone: Polypropylene, Voice Coil: 1”, Surround: Rubber, Dimensions: 3.4” x 7.5” x 7.5”, Mounting Depth: 2.2”, Mounting Hole: 5.8”
- BOSS Audio Systems provides a 6-year warranty on amplifiers and 3 years on speakers purchased is made on desertcart.com. We strongly encourage professional installation of this product to ensure proper and safe functionality

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item dimensions L x W x H | 7.5 x 5.3 x 1.7 inches |
| Voltage | 12 Volts |
| Manufacturer | BOSS Audio Systems |
| Mounting Type | Flush Mount |
| Brand | BOSS Audio Systems |
| Number of Channels | 4 |
| Output Power | 5E+2 Watts |
| Package Type Name | Box |
| Specification Met | Ipx7 |
| Material | Plastic |
| Global Trade Identification Number | 00791489123020 |
| UPC | 791489123020 |
| Item Weight | 10 pounds |
| Product Dimensions | 7.5 x 5.3 x 1.7 inches |
| Item model number | ASK904B.64 |
| Is Discontinued By Manufacturer | No |
| Wireless Remote | Yes |
| Warranty | 3 Year Platinum Online Dealer Warranty valid only on products Sold / Shipped by Amazon.com. This offer is not valid on purchases made from third party market place sellers |
| Expansion | Built-In Bluetooth |
| Memory Card Slot | MP3 |
| Weight | 4.5 Kilograms |

## Product Details

- **Item dimensions L x W x H:** 7.5 x 5.3 x 1.7 inches
- **Voltage:** 12 Volts
- **Manufacturer:** BOSS Audio Systems
- **Mounting Type:** Flush Mount
- **Brand:** BOSS Audio Systems

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/81-CElty91L.jpg)

## Available Options

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

## 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

### ⭐⭐⭐⭐⭐ Good Product!
*by B***S on August 5, 2021*

The media could not be loaded. 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.

### ⭐⭐⭐⭐⭐ Great small system for my Waverunner install.
*by P***T on July 11, 2016*

When brainstorming to add a stereo to my Yamaha Waveventure PWC, I came across this system and it seemed to fit my needs and the size of where I intended to put it. I wanted a way to listen to some music when floating or beached and didn't want to permanently modify my ski. So I installed this complete system in a spare front storage compartment. I'm also adding 2 3.5" speakers into a set of spare mirror housings.The system itself is small, light, and came with everything and seems to be well made, I'll update after use for some time and see how it holds up. For the price, I don't expect it to last forever.I tested it hooked to a YB14 series battery which is smaller than the one in my ski. I didn't hook up an ammeter, but this seems to draw very little power. I ran it on the bench via Bluetooth from my phone for 3 hours. Battery still showed 12.7 volts and charger said battery was still 95% capacity after the test. Battery drain being a concern, I'm very happy with this.The included speakers sound good. Not great, but as expected or better. For my needs, quite acceptable. The controls are easy to use. Blue tooth range is great. I tried it at up to 40 ft away and it worked fine.I'm pleased so far and have no complaints.Update 7/18/2017:One year later, still going strong and works as well as the day it was installed!Update 5/10/2018Almost 2 years later and still works as well as it did when new. And it lives a rough wet life in the front of my Waverunner. It has been moved to my 98 XL1200 which uses the same front storage tub and gets a lot of looks, listens and thumbs up for having a stereo in my ski. I also put the small Polk audio 3.5” speakers I had in the mirrors of my wave venture in the mounting plate. Still love this setup!Update: 10/25/2018Still working like New after another season in the ski. And in the off season I use it in my shop for a stereo. Still very happy!Update: 4/12/2019Still going.............All winter in my shop. And now back in the ski for another season on the water. Still works perfectly!Update 7/29/2019You guessed it.........still working perfectly.

### ⭐⭐⭐⭐⭐ Absolutely great sound for the price.
*by L***R on March 18, 2025*

Installed in my new 2025 Avid Rogue 20. Install was SUPER easy. I watched like 3 videos and felt like i had the jist of it. Mounted to the center console and it's pretty loud. I have a yamaha 150 and even WOT the music is easily audible. For the price, this is it. IF you're an audiophile, or looking for a better bass response, you're gonna have to add a sub and amp.

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-22*