1. Introduzione
This manual provides detailed instructions for the installation, operation, and maintenance of your MB Quart GMR1.5S2W Marine Audio System. This system includes a Bluetooth-enabled gauge mount source unit and two 6.5-inch coaxial marine-grade speakers, designed for durability and high-quality audio in marine and powersport environments.
The MB Quart GMR1.5S2W system is built to withstand harsh outdoor conditions, featuring waterproof, dustproof, sunproof, and shockproof construction that meets or exceeds IP67 requirements. It delivers 160 Watts peak power, ensuring clear and robust sound for your adventures.
2. Cosa c'è nella scatola
Upon opening your MB Quart GMR1.5S2W package, you will find the following components:
- MB Quart GMR1.5S2W Bluetooth Source Unit
- Two 6.5-inch Coaxial Marine Speakers
- Complete Wiring Harnesses
- Hardware di montaggio

Figure 2.1: All components of the MB Quart GMR1.5S2W Marine Audio System.
Video 2.1: An unboxing video demonstrating the contents of the MB Quart GMR1.5S2W package, including the source unit, speakers, and accessories.
3. Configurazione e installazione
Installation of the MB Quart GMR1.5S2W system is designed to be straightforward, requiring basic hand tools. The entire process can typically be completed within an hour, depending on your specific system configuration and vehicle.
3.1 Installazione degli altoparlanti
The 6.5-inch coaxial speakers are universal in size, making them easy to integrate into most marine and powersport applications. They require a total mounting depth of 2.99 inches (75.95mm) and a cutout diameter of 3.14 inches (79.76mm).

Figura 3.1: Esample of a 6.5-inch marine speaker installed in a boat panel.
3.2 Collegamenti di cablaggio
The system includes all necessary wiring harnesses. Each wire is conveniently labeled to ensure correct and easy connections, minimizing installation errors. The source unit provides four channels of output for the speakers and an additional RCA subwoofer output for expanding your audio system.

Figure 3.2: Labeled wiring harness for simplified installation.
3.3 Mounting the Source Unit
The gauge mount source unit comes with appropriate mounting hardware, including a U-bracket, threaded rods, and nuts, to secure it firmly in place.

Figure 3.3: Mounting bracket and hardware for the source unit.
4. Istruzioni per l'uso
The GMR1.5S2W source unit offers versatile connectivity and intuitive controls for your marine audio experience.
4.1 Connettività Bluetooth
The Bluetooth-enabled source unit allows for quick pairing with your mobile devices. It automatically connects to the last paired device, providing seamless access to your music library. Press the 'BT' button to activate Bluetooth pairing mode.
4.2 USB and Auxiliary Inputs
In addition to Bluetooth, the unit features a USB input for playing media from USB storage devices and an auxiliary RCA input for connecting other audio sources. Use the 'USB' and 'AUX' buttons to switch between these input modes.
4.3 Control Unit Functions
The circular control unit provides easy access to all essential audio functions:
- Pulsante BT: Attiva la modalità Bluetooth.
- Tasto USB: Seleziona l'ingresso USB.
- Pulsante AUX: Selects auxiliary RCA input.
- Pulsante Riproduci/Pausa (►►): Riproduce o mette in pausa la traccia corrente.
- Skip Forward Button (►►|): Passa alla traccia successiva.
- Skip Backward Button (|◄◄): Passa alla traccia precedente.
- Volume Knob (Center): Rotates to adjust the main volume.
- SUB- / SUB+ Buttons: Regola il livello di uscita del subwoofer.

Figura 4.1: Fronte view of the GMR1.5S2W control unit.
5. Manutenzione
To ensure the longevity and optimal performance of your MB Quart Marine Audio System, follow these maintenance guidelines:
- Pulizia: Regularly clean the speakers and control unit with a soft, damp cloth. Avoid abrasive cleaners or solvents that could damage the marine-grade finish.
- Verifiche della connessione: Periodically inspect all wiring connections for corrosion or looseness, especially after exposure to saltwater or harsh weather. Ensure all connections are secure and free from debris.
- Protezione: While the system is waterproof and dustproof, consider using protective covers when the boat or vehicle is stored for extended periods, especially in extreme conditions.
- Cura dell'ambiente: Avoid exposing the system to direct, prolonged sunlight when not in use, as this can degrade materials over time.
6. Risoluzione Dei Problemi
If you encounter issues with your MB Quart Marine Audio System, refer to the following common troubleshooting steps:
- Nessun potere:
- Check the main power connection and ensure it is securely connected to a 12V DC source.
- Verify that the vehicle's battery has sufficient charge.
- Inspect any inline fuses for the system and replace if blown.
- Nessun suono dagli altoparlanti:
- Ensure the volume is turned up on both the source unit and your connected device.
- Check all speaker wire connections for proper polarity and secure contact.
- Confirm the correct audio input source (Bluetooth, USB, AUX) is selected on the unit.
- If using the subwoofer output, ensure the subwoofer amplifier sia acceso e collegato correttamente.
- Bluetooth non si connette:
- Ensure Bluetooth is enabled on your mobile device and the source unit is in pairing mode.
- Forget the device from your mobile device's Bluetooth settings and attempt to re-pair.
- Move your mobile device closer to the source unit to ensure it is within range.
- Restart both the source unit and your mobile device.
If these steps do not resolve the issue, please contact MB Quart customer support for further assistance.
7. Specifiche
| Caratteristica | Specificazione |
|---|---|
| Nome del modello | GMR1.5S2W |
| Ingresso volumetage | 12 Volt (CC) |
| Tipo di altoparlante | Coassiale |
| Caratteristica speciale | Impermeabile (classificazione IP67) |
| Dispositivi compatibili | Smartphone, Tablet, Computer portatile |
| Dimensioni dell'altoparlante | 6.5 pollici |
| Diametro del woofer | 6.5 pollici |
| Potenza massima in uscita dell'altoparlante | 160 Watt (picco) |
| Gestione della potenza RMS (per altoparlante) | 40 Watt |
| Risposta in frequenza | 35 Hz - 21 kHz |
| Sensibilità dell'altoparlante | 89 dB |
| Tecnologia di connettività | Bluetooth, USB, Auxiliary (RCA) |
| Modalità di uscita audio | Surround (2.0 channel with subwoofer output) |
| Colore | Bianco |
| Numero di articoli | 2 (speakers) + 1 (source unit) |
| Peso dell'articolo | 5.13 libbre |
| Dimensioni del prodotto | 12 x 9 x 8 pollici (confezione) |
8. Garanzia e supporto
Your MB Quart GMR1.5S2W Marine Audio System comes with a Full Warranty, ensuring consistent out-of-the-box durability and peace of mind. Specific warranty details are typically provided with your product documentation.
For additional protection, 2-Year and 3-Year Protection Plans may be available for purchase. These plans offer extended coverage beyond the standard manufacturer's warranty.
For further support, technical assistance, or warranty claims, please visit the official MB Quart Store or contact their customer service department: