BOSS Audio Systems MCBK420B 3 Inch Motorcycle Speakers and 2 Channel Amplifier Package
Quick take
The BOSS Audio Systems MCBK420B is a handlebar-mountable motorcycle audio kit that pairs Bluetooth streaming with a 3.5 mm aux input, powered by an included compact Class D amplifier. It’s a good fit for riders who want simple controls (including an inline volume knob) and weather-resistant speakers for trail or road use. The main tradeoff is that bass performance is limited, and at highway speeds no small speaker setup will feel like a home stereo.
Pros and cons
Pros
- Bluetooth music streaming plus a 3.5 mm aux input for non-Bluetooth devices
- Weatherproof speaker design meant for moisture and splashed water exposure
- Included compact amplified setup (Class D amplifier) simplifies building a functional sound system
- Inline volume control helps you adjust volume without reaching for your phone
Cons
- Bass output is limited, especially if you expect deep low-end
- Designed around 3-inch full-range speakers, so sound will be constrained versus larger speaker systems
- Best results depend on installation choices and where you mount the speakers
What buyers think
Buyer-review evidence points to a generally “loud enough for the ride” experience, with clear, audible sound at moderate speeds. Several riders mention they can still hear music well while riding, even with typical motorcycle noise. There is also a recurring theme that bass may feel flat out of the box, but many buyers address it by adjusting their audio settings. Build quality and overall value come up positively, with riders describing the kit as straightforward to install and solid once mounted. Evidence around long-term durability appears favorable, including reports of the speakers continuing to function after exposure to water from cleaning.
What you’re getting with this kit
This package is built as a complete Bluetooth motorcycle audio system, combining two 3-inch full-range speakers with a compact 2-channel (stereo) Class D amplifier. It’s intended for outdoor, handlebar-style mounting, and it includes the practical accessories riders need for installation and control.
- Speakers: Two 3-inch matte black full-range speakers, designed to mount to handlebars using adjustable brackets (meant for handlebar diameters roughly from 0.75 in to 1.25 in).
- Amplifier: Included compact Class D amplifier (600 watts max) that powers the speakers.
- Bluetooth: Built-in Bluetooth streaming so you can play music from compatible devices (including common streaming apps).
- Aux input: A 3.5 mm auxiliary input for devices that do not use Bluetooth.
- Volume control: Wired inline volume control that mounts where it’s convenient for your ride.
Sound and clarity expectations (and the bass reality)
Because the system is built around 3-inch full-range speakers, the realistic expectation is clean, clear midrange-focused audio that cuts through typical riding noise better than many “cheap add-on” audio setups. Multiple reviews describe the sound as clear and loud enough for trail or moderate-speed riding. Bass performance is the most common limitation mentioned, with buyers noting it can come across flat until they adjust their music player’s settings (for example, boosting bass or changing audio profiles). If your priority is deep, thumpy low-end like a car subwoofer, you will likely be disappointed.
Bluetooth range and alternative music sources
The system uses built-in Bluetooth, with an advertised range up to about 30 feet. That is typically enough for keeping your phone in a fair pocket or nearby accessory location on a bike. For riders who prefer wired reliability, the 3.5 mm aux input supports playback from smartphones and MP3 players with an audio output. In practice, this dual input approach gives you flexibility if Bluetooth pairing or device behavior is not consistent on certain trips.
Weatherproofing and outdoor use
The speakers are weatherproof, designed to help protect against moisture and splashed water. That matters for day-to-day riding where you might run into rain, wet roads, or cleaning with water. While no speaker system should be treated like it is intended for submersion, the kit is clearly aimed at outdoor motorcycle use rather than indoor audio applications.
Installation fit: handlebar mounting and control placement
These speakers mount using adjustable brackets for handlebars in a specific diameter range, which helps make the setup compatible with many ATVs, UTVs, scooters, and motorcycles. Plan how you route wiring before you drill or secure anything. Buyers also emphasize that mounting position and how you manage wiring can affect the end result, especially for perceived volume and clarity.
Pros and cons recap
- Best for: Riders who want a compact, Bluetooth-first motorcycle speaker system with an included amplifier, handlebar mounting, and a convenient wired volume knob.
- Not ideal for: Anyone chasing deep bass or expecting a home-theater style frequency response from 3-inch speakers.
- Value call: Review patterns suggest solid overall value for audible, ride-friendly audio, with the main caveat being bass limitations.
Is it worth it?
The BOSS Audio Systems MCBK420B is worth considering if your goal is straightforward motorcycle audio, Bluetooth streaming convenience, and weather-resistant speakers in a ready-to-install package. If you have realistic expectations for small-speaker sound and you are comfortable dialing in the bass using your music app’s EQ, it can be a practical upgrade. If low-end impact is the deciding factor, you may want to explore larger speaker systems or setups designed specifically for stronger bass.
Price and availability
Check the current price and availability on Amazon for the most up-to-date listing details.
FAQ
Does the BOSS Audio Systems MCBK420B work with Bluetooth and wired playback?
Yes. It supports Bluetooth streaming and also includes a 3.5 mm aux input for wired playback from compatible devices.
How loud is this motorcycle speaker system?
Reviews commonly describe it as loud enough and clear for riding, particularly at lower to moderate speeds. Like most small-speaker systems, it will have limits as road noise increases.
Is the bass strong?
Bass output appears limited compared with full-size speaker setups. Some buyers report improved results by adjusting EQ or audio settings on their phone or music player.
Are the speakers actually weatherproof?
The speakers are designed for weatherproof outdoor use, intended to help protect against moisture and splashed water.
Will it fit my handlebar?
The included adjustable brackets are intended for handlebars in the approximate 0.75 in to 1.25 in range. Measure your handlebar diameter before ordering.
What’s the installation like?
It is designed for mounting on a bike, and buyers often describe the process as manageable. Planning wire routing and choosing good speaker placement matters for the final sound.
What size are the speakers?
The kit includes two 3-inch full-range speakers.
Specifications
| Product Title | BOSS Audio Systems MCBK420B 3 Inch Motorcycle Speakers and 2 Channel Amplifier Package - Bluetooth, Weatherproof, Volume Control, ATV UTV Compatible |
|---|---|
| Category | Electronics > Car & Vehicle Electronics > Vehicle Electronics Accessories > Audio & Video Accessories > Speaker Systems |
| Brand | BOSS Audio Systems |
| Manufacturer | BOSS Audio Systems |
| Model Name | MCBK420B |
| Model Number | MCBK420B |
| Color | Black |
| Item Weight | 3.8 Pounds |
| Audio Output Mode | Stereo |
| Mounting Type | Handlebar Mount |
| Enclosure Material | Plastic |
| Speaker Type | Outdoor |
| Additional Features | Amplified, Built-in Bluetooth, Weatherproof |
| Antenna Location | For Music Players |
| Is Waterproof | False |
| Warranty Type | Extended |
| Maximum Range | 30 Feet |
| Control Method | Remote |
| Speaker Size | 3 Inches |
| Woofer Diameter | 3 Inches |
| Tweeter Diameter | 1 Inches |
| Water Resistance Level | Water Resistant |
| Bluetooth Range | 30 Feet |
| Specific Uses For Product | Pro Audio |
| MP3 player | No |
| Controller Type | Remote Control |
| Unit Count | 1 Count |
Available variants
Style
- (2) 3" Chrome Speakers + Class D Amp
- (2) 3" Black Speakers + Class D Amp
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