MB Quart Polaris Off-Road Grade Audio
MB Quart Bobcat Audio

RV Audio

  • RV Audio
MB Quart brings decades of engineering with audio designed for cars and trucks to the market. We took our depth of technical know-how and audiophile passion and focused it on the marine and off-road applications over the last 20 years. Next step, the RV lifestyle at all levels.

You will see how simple building a system with MB Quart audio components can be for any vehicle.

We have curated some ideal system designs based on vehicle chassis and audio performance expectations. Of course, you can continue to expand the system with our KEY components.
Click a vehicle to learn more about its system design:
Class A Recreational Vehicle
Class A RV
Large Recreational Trailer
Large Trailer
Medium Recreational Trailer
Medium Trailer
Adventure Trailer
Adventure Trailer
All MB Quart systems are designed to be easily upgraded and augmented. Whether you choose from the tailored systems above or go completely custom and choose very component, MB Quart RV audio has everything you will need.

Featured below are some of the KEY components for any system. You will see that depending on if your application is interior or exterior you can choose from a wide variety of RV, Mobile, Marine and Off-Road audio components.
Multimedia, Multi-Audio Zone and Gauge Mount Source Units. All units feature internal amplifiers to power a small speaker system while offering connections to power external amplifiers.
RV Audio
Compact, waterproof and standard amplifier options with multiple channels for system configurations. Amplifiers add critical music dynamics to all systems installed in large vehicles regardless of your preferred music style.
RV Audio
Everything hits your ears from the speakers. We have been designing speakers since 1962. MB Quart offers every size from tiny full range to large deep bass subwoofers. From door fitment to outdoor solutions.
RV Audio


GMR-3 Powered Source Unit

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Marine Bluetooth Source Unit with Carbon Fiber look

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  • Marine Bluetooth Source Unit with Carbon Fiber look
  • Marine Bluetooth Source Unit with Carbon Fiber look
  • Marine Bluetooth Source Unit with Carbon Fiber look


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Part#: GMR-3 | MSRP: $249.99


180 watt powered Bluetooth AM/FM gauge mount radio with Carbon Fiber look.
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Part #: GMR-3 | SKU: 806576227434 | Category: Bluetooth Source Units
MB Quart GMR-3, Bluetooth AM/FM gauge mount radio featuring Apple control which brings more control between your Apple devices. Internal 4 channel amplifier delivers 180 watts, including aux input and 4 volt pre-amp outputs.

Also check out the GMR-WREM waterproof wired remote control for your GMR-3.


Part #: GMR-3 | SKU: 806576227434 | Category: Bluetooth Source Units
  • Tuner Section FM Stereo Frequency Range
  • Tuner Section S/N Ratio
  • Bluetooth Range
    32' - 10 Meter
  • RMS Power Output
    20 x 4
  • Peak Power Output
    40 x 4
  • S/N @1W
  • Frequency Response(Aux In)
    85Hz - 20kHZ
  • Pre-amp Outputs (Y/N #)
    2pr - Front/Rear
  • Pre-amp Voltage
  • Minimum Impedance
  • Display Type
  • Display Backlit
  • LCD Font Size
  • Dimensions Mounting Hole (Inches) 
  • Dimensions Total Mounting Depth
  • Dimensions Mounting Bezel (Round)
  • Product Weight
    1.5 lbs (0.6 kg)

System Includes

Part #: GMR-3 | SKU: 806576227434 | Category: Bluetooth Source Units
More info in development & coming soon!

Features & Benefits

Part #: GMR-3 | SKU: 806576227434 | Category: Bluetooth Source Units
  • Marine Grade Protection: Yes Meets or exceeds the American Society for Testing and Materials (ASTM) standards
  • Life Shield: Yes This product has been designed and tested against the elements. Waterproof, dust proof, snow proof or shock proof. Built to handle the outdoors.
  • Apple Control: Yes Quick control and access of iTunes collection with iPhone, iPod and iPad
  • Source Type: AM/FM/Bluetooth Enabled Gauge Mount Radio Allows all access to radio stations and content from Bluetooth enabled devices.
  • Input Types: Bluetooth, RCA, USB Nearly nothing the device can not play. Cassettes and 8-tracks not withstanding
  • Control Buttons: Large & Waterproof Play/Pause, Tracks Forward/Back, Volume Up/Down and Power On/Off are all protected from the elements with the large waterproof button. Their size and space also makes them easy to operate with riding gloves on.
  • Bluetooth™ Connect: YES Bluetooth™ Connect allows your phone or other Bluetooth enabled device to be quickly paired to the controller without a complicated pairing process.
  • Secure Simple Pairing™: YES Quick and secure wireless connection between your Bluetooth enabled device. This reliable connection is impervious to outside interference, providing a lock-tight connection to your audio system.
  • Quick-Pair™: YES No more frustration with trying to pair. When the unit powers up, it immediately connects to the last device connected. For a first time connection, you only have to select "MB Quart" from your Bluetooth menu and you are connected, QUICKLY.
  • Built-In Power: YES Four channels with 40 watts of output. These channels remain active when running external amplifiers (RCA Output) to run additional speakers in the cabin.
  • Additional Inputs: 1 pair RCA (AUX)


Part #: GMR-3 | SKU: 806576227434 | Category: Bluetooth Source Units


MB Quart offers several solutions to put music into an audio system. New this year is GMR-3. The newest and most technically advanced AM/FM Source Unit ever conceived, by the MB Quart engineering team.

MB Quart GMR-3

The MB Quart Nautic GMR Marine & Powersports source units are the perfect solution for any vehicle that will be exposed to the elements. The GMR line has been extensively tested to be waterproof, dust proof and UV stable.


Part #: GMR-3 | SKU: 806576227434 | Category: Bluetooth Source Units
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