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

Bluetooth Source Units

  • Source Units
  • Source Units
  • Source Units
  • Source Units
MB Quart offers several solutions to put music into an audio system for boats, off-road, RV and custom car builds.
In our Gauge Mount Radio series or GMR, the top of the line is the GMR-LED. This multimedia powerhouse is an AM/FM/Bluetooth®, USB, and Mobile Entertainment Controller for OFF-ROAD & Marine applications.
Source Units
For the RV enthusiast, we offer a compact Multimedia Digital Receiver (part number MDR2.0). This unit is perfect for an RV with enough power to a vehicle full of speakers and a dual audio zone control for fine tuning the audio throughout the vehicle environment.
Source Units
Next are the GMR2.5 and GMR-3. These are technically advanced AM/FM bluetooth Source Units. These units are the most innovative ever offered by the MB Quart engineering team.
Source Units
GMR-3 installed in a Polaris RZR
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.

For applications where you only need the Bluetooth controller, check out the switch mounted N2-WBT. You will be shocked at the amount of tech we can pack into a small unit.
Source Units
All MB Quart bluetooth units include Quick Pair for simple connections to devices
The N2-WBT is a carling switch mount Bluetooth Controller with a Joystick Operation and a Pre-amplifier Output. This innovative design makes it perfect to slip into an available accessory switch in the dash of a boat, off road vehicle or custom car build.
Source Units
Bluetooth Joystick, actual size
All MB Quart Nautic amplifiers are IPX certified which defines those marine amplifiers must use conformal coated PC boards to resist corrosion from salt spray & moisture.

To create the perfect system, choose from the following MB Quart categories to power your system:
Compression Horn Towers
Compression Horns
Wake Tower Speakers
Wake Towers
Waterproof Speakers
Waterproof Speakers
Nautic Subwoofers
Nautic Subwoofers
Marine Amplifiers
Marine Amplifiers
Powersports Amplifiers
Powersports Amplifiers

GMR-LCD Powered Source Unit

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Part#: GMR-LCD


160 Watt Powered OFF-ROAD & Marine Multimedia Source Unit.


Part #: GMR-LCD | SKU: 806576231523 | Category: Bluetooth Source Units
MB Quart OFF-ROAD & Marine Multimedia Source Unit with 160 Watt internal amplifier features AM/FM/Bluetooth.


Part #: GMR-LCD | SKU: 806576231523 | Category: Bluetooth Source Units
  • IPX Rating
  • Source Unit Tuner Section FM Stereo Frequency Range
    87.5MHz - 108MHz
  • Source Unit Tuner Section S/N Ratio
    > 55dB
  • Source Unit Bluetooth Range (ft)
    32 (10m)
  • Source Unit RMS Power Output (watts)
    4 x 20
  • Source Unit Peak Power Output (watts)
    4 x 40
  • Source Unit S/N @1W
  • Source Unit Frequency Response (Aux In)
    85Hz - 20KHz
  • Source Unit Pre-amp Outputs (Y/N #)
    2pr - Front/Rear
  • Source Unit Pre-amp Voltage
  • Source Unit Minimum Impedance (ohms)
  • Source Unit Display Type
  • Source Unit Display Backlit
  • Source Unit LCD Font Size
  • Source Unit Dimensions Mounting Hole (in)
  • Source Unit Dimensions Total Mounting Depth (in)
  • Source Unit Dimensions Mounting Bezel (Round) (in)
  • Item Length (in)
  • Item Width (in)
  • Item Height (in)

System Includes

Part #: GMR-LCD | SKU: 806576231523 | Category: Bluetooth Source Units
More info in development & coming soon!

Features & Benefits

Part #: GMR-LCD | SKU: 806576231523 | Category: Bluetooth Source Units
  • Compatible Vehicle Fitment
  • Marine Grade Protection / IPX Rating
    This product has been designed and tested against the elements. Waterproof, dustproof, snowproof or shockproof. Built to handle the outdoors. Meets or exceeds IP67 requirements for water and dust proofing.
  • Apple® Control
    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.
  • Control Buttons
    Unit is adjusted by master knob and menu selection.
  • Bluetooth® Connect
    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™
    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™
    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
    Four channels of output. These channels remain active when running external amplifiers (RCA Output) to run additional speakers in the vehicle.
  • Control Method
    Unit is adjusted by master knob and menu selection.
  • AM/FM Tuner Presets
    AM: 8 station, FM: 12 station AM1, AM2, FM1, FM2, FM3 each memorize 4 stations each.
  • Frequency Range
    FM: 87.5 - 108, AM: 530 - 1710
  • Video Input
  • Video Input Trigger
  • USB / Apple® / Charging Port
    1 - USB
  • Bluetooth® Version
    Version 4.2
  • Album Art
  • User Presets
  • Main Connector Type
    MOLEX connector for simple installation and removal of unit when needed.
  • Media Screen
    On board 3.5 inch high-contrast LCD screen.


Part #: GMR-LCD | SKU: 806576231523 | Category: Bluetooth Source Units
More info in development & coming soon!


Part #: GMR-LCD | SKU: 806576231523 | Category: Bluetooth Source Units
Files & Manuals

Additional Info & Release Notes
  • V1.8.4 Firmware Update:
    • Fixes for: Adding selection of RF Remote On/Off Feature and Bluetooth device name.

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