BOSS Audio Systems

BOSS Audio Systems MC420B 3 Inch Motorcycle Speakers and Amplifier Sound System Class D Amplifier Weatherproof Volume Control

1150+ bought in the past month

$93.04

About this item

  • Bluetooth - Play and control a vast library of your favorite music using your smartphone or MP3 device, plus plug into apps like Spotify and Pandora wirelessly
  • Amplified - A Bluetooth, compact, weatherproof, class D amplifier is included. It has been sealed with the latest weatherproofing techniques to protect against a rainy forecast
  • Weatherproof - The MC420B has been outfitted with the latest weatherproofing techniques for protection against the elements
  • Speakers - Also included are two 3-inch chrome full range speakers. The adjustable brackets will fit handlebars from ranging from .75” to 1.25”
  • Playback - A 3.5 mm Auxiliary input located on the side of the amplifier is compatible with audio outputs of smartphones and MP3 players
  • Volume Control - A convenient inline volume control (attached to the amplifier) can be installed in a place of your choosing, making sure that when the need hits… so will your tunes
  • BOSS Audio Systems provides a powerful 3-year platinum online dealer warranty so long as the purchase is made through Amazon.com. We strongly encourage professional installation of this product to ensure proper and safe functionality
$93.04

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Product details

BrandBOSS Audio Systems
Speaker Maximum Output Power600 Watts
Connectivity TechnologyBluetooth
Audio Output ModeStereo
Input Voltage12 Volts

Technical specifications

mounting_typeHandlebar Mount
materialMetal
model_nameMC420B
speaker_typeTweeter
special_featureBluetooth
recommended_uses_for_productVolume
compatible_devicesSmartphone, Tablet, MP3 Player
subwoofer_diameter3 Inches
unit_count1.0 Count
surround_sound_channel_configuration3.0
colorSilver
included_componentsBOSS AUDIO MC420B
product_dimensions4.5"D x 4"W x 4"H
item_weight4 pounds
impedance4 Ohms
is_waterproofFALSE
warranty_typeExtended
maximum_range25 Meters
number_of_items2
control_methodApp
wireless_communication_technologyBluetooth
speaker_size3 Inches
power_sourceBattery Powered
signaltonoise_ratio85
woofer_diameter3 Inches
tweeter_diameter3 Inches
water_resistance_levelWater Resistant
customer_package_typeStandard Packaging
number_of_batteries1 12V batteries required.
audio_driver_typeDynamic Driver
bluetooth_range25 Meters
subwoofer_connectivity_technologyWired
number_of_circuits2
number_of_power_levels2
specific_uses_for_productpersonal, gaming, business
upc791489121842 801940118035 506087193098 012304293811 804892188439
style(2) 3" Chrome Speakers + Class D Amp
global_trade_identification_number00791489121842
manufacturerBOSS Audio Systems
shapeirregular shape
set_nameBOSS Audio Systems MC420B 3 Inch Motorcycle Speakers and Amplifier Audio Sound System
item_model_numberMC420B
batteries1 12V batteries required.
best_sellers_rank#5 in Powersports Speaker Systems
is_discontinued_by_manufacturerNo
date_first_availableFebruary 28, 2014

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Customer reviews

4.36,992 ratings

Customers say

Customers find these motorcycle speakers to be good value for money and appreciate their sound quality and ease of installation, particularly noting that wiring is straightforward.

★★★★★

2008 Harley Davidson Sportster 1200 Install!

Door ManApril 7, 2019

Quality product! Sound is awesome for a $60 system, at 40mph and lower its great. It's plenty loud enough, but as you approach 60 mph and up truth is no stereo is going to sound like a home audiophile system. Bottom line is 'buy it'! Customer service is first rate, they are great! Also, I read some complaints about bass. When I first connected the speakers they too sounded a bit flat. I clicked onto my Poweramp music player and set it to large concert hall and max bass and presto... truly impressive rich sound! My install - I mounted the speakers on the handlebars just inside the windshield. Then, ran all the wires and the amp into a small, front fork mounted, 'tool bag' type pouch. The main issue is the red hot wire. I must have watched a dozen youtube videos on this subject. I usually ride with my high beam on. I know its obnoxious, but down here in Florida anything you can do to stay visible is a life saver. I unscrewed the chrome cover that holds the daymaker headlight in place. Sadly, Harley does not provide an auxiliary wire in the headlight wiring harness of Sportster's. At least not in mine. There are three wires entering the headlight assembly from a hole in the back. Black wire is ground, white wire is High Beam, yellow wire is Low Beam. I used a plastic splice connector from Home Depot to connect the red Boss power wire to the white High Beam wire. (AMP Splice Tap Connectors 10 pack). The hole in the back of the headlight assembly where Harley runs the headlight wires - Harley runs the wire harness though the hole with a rubber bushing that protects the wires and keeps water from getting in. I tried to slice the rubber bushing so that I could add the Boss red hotwire but it was cramped quarters and I couldnt get in there without taking the chance of cutting the headlight wires also. You may be able to do it, I couldn't. I ran the red power wire through the hole and at the point where it touched the metal headlight housing I covered the wire with an extra couple of layers of electrical tape to protect it from the housing wearing through the insulation and shorting the amp. Then, pushed the rubber bushing back into the hole. It wasn't a perfect fit, there was a slight gap because of the red wire I installed. It also wasn't a terrible fit - and then I put the headlight and headlight retainer back into place. After continual testing at every stage, and when I was sure all worked as it should, I used a dab of black silicone caulk and filled in the gap between the rubber bushing and the outside of the headlight assembly. This also helped hold the red power wire in place and reduce any chance of shorting against the headlight casing. I ran the ground wire outside the headlight housing for a few inches to a windshield mounting bolt and tightened it down. (I didn't want the ground wire taking up space going through the headlight hole, so I split the red power wire and the ground wire before the power wire entered the headlight housing hole. You may find it works just fine running both wires through, especially after using caulk to close up the hole where the wires enter.) Finally, I used zip ties to connect the volume button to the left side windshield mount, very close to where my hand naturally fits onto the handlebar grip. I believe you want the volume control where your left hand can safely get to it without too much reaching. Final result is my Boss audio system works only when the high beam is on. And when the bike is turned off there is no chance of the amp staying on and draining the battery. Also, my install required no drilling, no running wires under gas tanks and seats, and no toggle switch. I love having music now!!! Safe riding! Read more

★★★★★

Worth every penny

leon payneJanuary 1, 2026

I don’t do reviews but I had to express my gratitude for these speakers! After hearing reviews and carefully weighing my options for pricing and quality, I can say that these speakers are well worth the value! I have a 750 original pipes and a 800cc and these speakers are heard BEYOND expectations on both motorcycles!! It makes the ride so much more enjoyable! They have been in the rain and still work as new! Definitely recommend for motorcycle riding and enjoyable experience! Read more

★★★★☆

Happy buyer

Kavin MitchellOctober 2, 2025

Initial installation was smooth and easy! Sounds good the only downfall is that it can’t be tuned and distorts if you go past half way, still gave it 4 stars because it does sound good and clear blutooth connects smoothly! Great quality! Would buy again Read more

★★★★★

Easy Install, Good Sound, No Battery Drain

JayJuly 1, 2025

The media could not be loaded. Installed on a Can-Am Ryker (stock exhaust) BOSS Audio Systems MCBK420B Bluetooth Speaker System Overall, this is a solid little setup—especially for the price! Installation was super easy. I wired it directly to the battery, and despite what some reviews say, I haven’t had any battery drain issues. The volume knob doubles as the on/off switch—just remember to turn it off when you’re done, and you’re good to go. I’ve tested it like this for several days with no problems. As for sound: you definitely get clear highs and mids, but don’t expect any bass—this is a budget-friendly system after all. Still, it’s way better than riding in silence. I can hear my music clearly at around 40 MPH. And when you’re stopped? It’s almost too loud—my ears were ringing a bit from the volume, haha! Read more

★★★★★

Loud and serviceable

NateOctober 8, 2025

Installed the BOSS Audio MC420B 3-inch motorcycle speakers and amp on my piped and jetted VStar 1100. They’re loud enough to hear over the exhaust, which is great. Sound quality isn’t the best—higher volumes get a bit tinny—but overall, they outperform most other brands in this price range. Solid choice for riders who need volume more than audiophile quality. Read more

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