Bluetooth Source Units

Bluetooth Source Units

This year, MB Quart launches the GMR-3. The newest and most technically advanced AM/FM Source Unit ever conceived, by the MB Quart engineering team.


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.


MB Quart’s Bluetooth Connect™ allows you to stream music from your favorite handheld device via Bluetooth™ opening up a world of entertainment options. The GMR-3 and GMR-2 both feature Apple control which brings more control between your Apple devices.


The RCA auxiliary audio input on the rear can be used to play the audio from other sources like satellite radios or non-Bluetooth portable devices. The GMR units also play digital MP3 or WMA files through the rear USB port. Additionally, the GMR-2 allows for the addition of 1 or 2 wired GMRWDR remote controls.

Life Shield
When you see this Life Shield badge on an MB Quart product, you can rest assured you are choosing a product that has been designed and tested against the elements. Whether it’s waterproof, dust proof, snow proof or shock proof, you will know that this product has been built to handle the outdoors.


Bluetooth™ Connect
Whoever brings the best music in their mobile device gets to be the DJ. Bluetooth™ Connect allows the Nautic GMR powered Bluetooth source units to easily connect BT enabled devices and puts the music right at your fingertips.


Bluetooth Source Units
AM/FM and Pre Amp
The MB Quart Nautic GMR source units are the control units for your Marine or Power Sports vehicle. Designed with a powerful tuner section and the ability to drive two discreet channels of outboard amplification.


Bluetooth Source Units
Big Power
The Nautic GMR units have built-in power. Four channels with 40 watts of output. These channels remain active when running external amplifiers so you can run additional speakers in the cabin.


Bluetooth Source Units
Optional PSAP-2 Dual Input Waterproof powersports accessory plug. Easy to access USB and 3.5mm input with a 10 foot USB and RCA extension. Requires 1 inch cutout in mounting surface.


Bluetooth Source Units
Gauge Mount
The GMR line of Powered Bluetooth™ Source Units are designed as “gauge mount” radios. This allows them to easily be installed in the same width and depth as a dash gauge. Especially important is the shallow dimensions.


Bluetooth Source Units
Splash Proof
The lens of all Nautic GMR powered units have been treated to resist fresh and saltwater splashing, dust devils, mud and adult beverages.

EXTRA CONTROLS The GMR-2 allows for additional control wired remote controllers. With the optional GMRWDR your phone can be tucked safely way while connected to Bluetooth and a GMRWDR controller can be mounted up front in the cabin with a second unit on the swim platform. Source Unit Options
MB Quart offers both AM/FM, Bluetooth source units with built-in amplifiers or smaller Bluetooth controllers that require an external amplifier or two. Regardless if your system is simple or complex, there is a solution for your build. Use this chart to compare features of all current models.

AM/FM Stereo Radio    
Bluetooth Audio Streaming
USB Charging  
USB Audio    
iPod / iPhone Control (USB)      
RCA Output ✔ - 1

✔ - 2

Auxiliary RCA Input   ✔ - 1

✔ - 2

Accessory Remote Output      
Speaker Output    


To create the perfect system choose from the following MB Quart categories to power your system:
All MB Quart Nautic amplifiers are ABYC & ASTM certified which defines that marine amplifiers must use conformal coated PC boards to resist corrosion from salt spray & moisture.



GMR-3 Source Unit

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Marine Bluetooth Source Unit

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  • Marine Bluetooth Source Unit
  • Marine Bluetooth Source Unit
  • Marine Bluetooth Source Unit

GMR-3 Source Unit

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Part#: GMR-3


180 watt powered Bluetooth AM/FM gauge mount radio with Carbon Fiber look

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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 pre-amp outputs.

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

  • 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 #)
  • Pre-amp Voltage
  • Display Type
  • Display Backlit
  • LCD Font Size
  • Minimum Impedance
  • Dimensions Mounting Hole
    3.12" - 7.93cm
  • Dimensions Mounting Depth
    2.87" - 7.30cm
  • Dimensions Mounting Bezel (Width x Height x Depth)
    5 x 4 x 1 inches - 12.8 x 10.2 x 2.6 cm
  • Product Dimensions
    5 x 4 x 1 inches - 12.8 x 10.2 x 2.6 cm
  • Product Weight
    1.5 lbs (0.6 kg)

Features & Benefits
  • Marine Grade Protection: Yes
    Meets or excceds the American Boat and Yacht Council (ABYC) marine electronics standards and the American Society for Testing and Materials (ASTM)
  • 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
    All the current popular digital files can be played on this unit
  • 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.
  • Built-In Power: YES
    Four channels with 40 watts of output. These channels remain active when running external amplifiers (Front and Rear RCA Outputs) to run additional speakers
  • Additional Inputs:
    1 pair RCA (AUX)

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