MB Quart RW-108A 600W Reference Series Active Powered Subwoofer Instruction Manual

Introduction

The MB Quart RW-108A is a compact, active powered subwoofer enclosure designed to deliver powerful bass in vehicles with limited space. Its slim form factor allows for easy installation, typically under a seat, providing enhanced audio performance without sacrificing cabin room. This all-inclusive solution features a built-in amplifier and advanced protection circuits to ensure longevity and reliable operation. The unit is constructed from durable aluminum, aiding in heat dissipation, and includes a protective metal grille for the diaphragm.

Safety Information

Please read and understand all instructions before operating this product. Failure to follow these instructions may result in injury or damage to the product or vehicle.

• Always disconnect the vehicle's battery negative terminal before beginning any installation.
• Ensure proper grounding of the subwoofer unit to the vehicle chassis.
• Use appropriate gauge wiring for power, ground, and speaker connections to prevent overheating and ensure optimal performance.
• Do not mount the subwoofer in a location that obstructs vehicle operation or safety devices.
• Avoid exposing the unit to moisture or extreme temperatures. This product is not waterproof.
• If you are unsure about any installation steps, consult a professional car audio installer.

Package Contents

Verify that all items are present in the package:

• MB Quart RW-108A Active Powered Subwoofer Unit
• Wired Bass Remote Control
• Mounting Hardware (screws, brackets)
• Wiring Harness (for power, ground, remote, and signal inputs)

Product Overview

Familiarize yourself with the components and controls of your MB Quart RW-108A subwoofer.

Figure 1: MB Quart RW-108A Active Powered Subwoofer with its wired remote control. The compact design is evident, suitable for under-seat installation.

Rear Panel Connections and Controls

Figure 2: Detailed view of the subwoofer's rear panel, displaying power input terminals (+12V, REM, GND), fuse, high-level and low-level (RCA) inputs, remote control port, and adjustment knobs for Input Level, Bass Boost, Low Pass filter, and Phase. Indicator lights for Power and Protect are also visible.

• Power Input (+12V, REM, GND): Terminals for connecting to the vehicle's power, remote turn-on, and ground.
• Fuse: Integrated fuse for circuit protection.
• Line Inputs (High Level / Low Level): Connections for audio signal from your head unit. High-level inputs are for speaker-level signals, while low-level inputs are for RCA pre-outs.
• Remote Control Port: Connects the wired bass remote.
• Input Level (Gain): Adjusts the input sensitivity to match the output of your head unit.
• Bass Boost: Provides an adjustable boost to bass frequencies.
• Low Pass Filter (LPF): Sets the upper frequency limit for the subwoofer, allowing only frequencies below the set point to pass through.
• Phase: Switches the phase of the subwoofer output (0° or 180°) to optimize bass integration with other speakers.
• Auto Turn On: Switch to enable or disable automatic turn-on via DC offset or audio signal detection.
• Power/Protect Indicators: LEDs indicating operational status (Power) or fault conditions (Protect).

Wired Bass Remote Control

Figure 3: The wired bass remote control, featuring a rotary knob for adjusting the subwoofer's output level (Min to Max).

The wired bass remote allows for convenient adjustment of the subwoofer's output level from the driver's seat, providing on-the-fly control over bass intensity.

Setup and Installation

Proper installation is crucial for optimal performance and safety. If you are not comfortable with car audio wiring, seek professional assistance.

Mounting Location

Figure 4: The MB Quart RW-108A subwoofer with its compact dimensions: approximately 13 inches (length) x 9.25 inches (width) x 2.25 inches (height). These dimensions make it suitable for under-seat or other confined spaces.

The MB Quart RW-108A is designed for compact spaces. Common mounting locations include:

• Under a car seat (most common).
• In the trunk or cargo area, secured to a flat surface.
• Behind a truck seat.

Ensure the chosen location allows for adequate air circulation around the unit to prevent overheating. Secure the subwoofer firmly using the provided mounting hardware to prevent movement during vehicle operation.

Wiring Connections

1. Ground Connection (GND): Connect the ground terminal to a clean, unpainted metal surface of the vehicle chassis. Ensure a solid, low-resistance connection.
2. Remote Turn-On (REM): Connect this terminal to the remote output wire from your head unit. This wire signals the subwoofer to turn on and off with your vehicle's audio system. If your head unit does not have a remote output, you can use the "Auto Turn On" feature (see Product Overview).
3. Power Connection (+12V): Connect this terminal directly to the positive terminal of your vehicle's battery. An in-line fuse (not supplied, but typically included in wiring kits) must be installed within 18 inches (45 cm) of the battery.
4. Audio Signal Input:
   • Low-Level Input (RCA): If your head unit has RCA pre-outs, connect them to the subwoofer's RCA inputs.
   • High-Level Input (Speaker Level): If your head unit does not have RCA outputs, connect the speaker wires from your head unit to the subwoofer's high-level input terminals.
5. Wired Bass Remote: Plug the wired remote control into its dedicated port on the subwoofer's rear panel. Route the cable to a convenient location for the driver.

Operating Instructions

Once installed, follow these steps to configure and operate your subwoofer:

1. Initial Power On: Reconnect the vehicle's battery. Turn on your head unit. The Power indicator on the subwoofer should illuminate.
2. Set Input Level (Gain):
   • Turn the Input Level knob on the subwoofer to its minimum setting.
   • Play a familiar piece of music with strong bass content through your head unit at about 75% of its maximum volume.
   • Slowly increase the Input Level knob on the subwoofer until you hear distortion, then back it off slightly until the sound is clean.
3. Adjust Low Pass Filter (LPF): Set the LPF knob to blend the subwoofer's output seamlessly with your main speakers. A common starting point is between 80Hz and 120Hz. Experiment to find the best sound for your vehicle and music.
4. Adjust Bass Boost: Use the Bass Boost knob sparingly. Excessive bass boost can lead to distortion and potential damage. Adjust to your preference for added low-end impact.
5. Set Phase: Toggle the Phase switch (0° or 180°) while listening to music. Choose the setting that provides the most impactful and cohesive bass response. This helps align the subwoofer's sound waves with your main speakers.
6. Using the Wired Bass Remote: The remote control allows you to adjust the overall bass level on the fly without needing to access the subwoofer unit directly. Turn the knob to increase or decrease the bass output.

Maintenance

Regular maintenance ensures the longevity and optimal performance of your subwoofer.

• Cleaning: Use a soft, dry cloth to wipe down the unit. Do not use harsh chemicals or abrasive cleaners.
• Ventilation: Ensure that the area around the subwoofer remains clear of obstructions to allow for proper heat dissipation.
• Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion.
• Fuse: If the subwoofer stops working, check the integrated fuse on the rear panel. Replace it only with a fuse of the same type and rating.

Troubleshooting

If you experience issues with your MB Quart RW-108A subwoofer, refer to the table below for common problems and solutions.

Specifications

Note: Product dimensions listed in specifications may refer to packaging. Actual unit dimensions are approximately 13" L x 9.25" W x 2.25" H.

Warranty and Support

This MB Quart product comes with a limited warranty. Please refer to the warranty card included with your product for specific terms and conditions.

For technical support, troubleshooting assistance, or warranty claims, please contact MB Quart customer service through their official website or authorized service centers. Keep your proof of purchase for warranty validation.