1. Introduction
Thank you for choosing the MB Quart NA2-400.1 Compact Mono Powersports Amplifier. This amplifier is designed to deliver powerful and clear audio for your subwoofer in various powersports applications. Its compact size and robust construction make it ideal for environments where space and durability are critical. This manual provides essential information for proper installation, operation, and maintenance of your amplifier.
2. Safety Information
Please read all safety instructions carefully before installing and operating the amplifier. Failure to follow these guidelines may result in injury, damage to the amplifier, or damage to your vehicle.
- Power Source: Ensure the amplifier is connected to a 12V DC power source with proper grounding.
- Wiring: Use appropriate gauge wiring for power and speaker connections to prevent overheating and ensure optimal performance.
- Fusing: Always install an external fuse (30 Amps recommended) on the main power wire as close to the vehicle's battery as possible.
- Mounting: Mount the amplifier securely in a location that allows for adequate ventilation and is protected from direct water exposure, excessive heat, and vibrations.
- Professional Installation: If you are unsure about any aspect of the installation, consult a qualified professional.
- Hearing Protection: Prolonged exposure to high volume levels can cause permanent hearing damage.
3. Product Overview
The MB Quart NA2-400.1 amplifier features a compact design with robust capabilities for powersports environments. Key components include:
- RCA Audio Inputs: For connecting to your head unit or audio source.
- Level Control: Adjusts the input sensitivity to match your source unit's output.
- Low Pass Filter (LPF): Adjustable crossover to filter out high frequencies for subwoofer operation.
- Subsonic Filter: Filters out extremely low frequencies that are inaudible and can damage subwoofers.
- Bass Boost: Provides adjustable bass enhancement.
- Quick Release Connectors: For simplified power and speaker wire connections.
- Remote Bass Control: Allows for convenient adjustment of bass levels from the driver's seat.
Figure 3.1: Main view of the MB Quart NA2-400.1 amplifier, showcasing its compact design and robust casing.
Figure 3.2: Close-up of the amplifier's input and control panel, showing RCA inputs, Level, LPF, Subsonic, and Boost controls.
Figure 3.3: View of the amplifier's power input, speaker output, and protection indicator connections, featuring quick-release Molex connectors.
4. Setup and Installation
Proper installation is crucial for optimal performance and longevity of your amplifier. Follow these steps carefully:
- Disconnect Battery: Before starting any wiring, disconnect the negative terminal of your vehicle's battery to prevent electrical shorts.
- Mounting Location: Choose a dry, well-ventilated location away from direct heat sources and moisture. Ensure there is enough space for air circulation around the amplifier. Secure the amplifier using appropriate mounting hardware.
- Power Wiring:
- Connect a 10 gauge power wire from the positive (+) terminal of your vehicle's battery to the amplifier's "POWER INPUT" terminal (Molex connector).
- Install a 30 Amp fuse holder with a 30 Amp fuse on this power wire, as close to the battery as possible (within 18 inches).
- Connect a 10 gauge ground wire from the amplifier's "GND" terminal (Molex connector) to a clean, unpainted metal surface on the vehicle chassis. Ensure a solid, low-resistance connection.
- Connect the remote turn-on wire from your head unit's remote output to the amplifier's "REM" terminal (Molex connector).
- Audio Input Connection: Connect RCA cables from your head unit's subwoofer or full-range RCA outputs to the amplifier's "INPUT" (L and R) RCA jacks.
- Speaker Output Connection: Connect your subwoofer's speaker wires to the amplifier's "SPEAKER OUTPUT" terminals (Molex connector). Observe correct polarity (+ to + and - to -). The amplifier is designed for mono subwoofer applications.
- Remote Bass Control: If using the included remote bass control, connect its cable to the designated port on the amplifier.
- Reconnect Battery: Once all connections are secure and verified, reconnect the negative terminal of your vehicle's battery.
5. Operating Instructions
After installation, follow these steps to configure and operate your amplifier:
- Initial Settings: Before turning on your audio system, set the amplifier's controls to their initial positions:
- LEVEL: Minimum (fully counter-clockwise).
- LPF (Low Pass Filter): Start at approximately 80Hz.
- SUBSONIC: Start at approximately 25Hz or 30Hz.
- BASS BOOST: 0dB (fully counter-clockwise).
- Power On: Turn on your vehicle's ignition and head unit. The amplifier's power indicator (blue LED) should illuminate. If the protect indicator (red LED) illuminates, refer to the Troubleshooting section.
- Gain Adjustment (LEVEL):
- Play a familiar piece of music with a strong bass presence.
- Set your head unit's volume to about 75-80% of its maximum.
- Slowly increase the amplifier's LEVEL control until you hear distortion, then back off slightly until the sound is clean. This sets the gain to match your head unit's output without clipping.
- Crossover Adjustment (LPF): Adjust the LPF control to blend the subwoofer's output seamlessly with your main speakers. A common starting point is 80Hz, but this can vary based on your speakers and personal preference.
- Subsonic Filter Adjustment: Set the Subsonic filter to protect your subwoofer from playing frequencies below its resonant frequency, which can cause damage. A common setting is 25-30Hz, or slightly below your LPF setting if your subwoofer can handle lower frequencies.
- Bass Boost Adjustment: Use the BASS BOOST control sparingly to enhance bass output. Excessive bass boost can lead to distortion and potential damage to your subwoofer.
- Remote Bass Control: Use the remote bass control for convenient, on-the-fly adjustments to the subwoofer's output level.
6. Maintenance
The MB Quart NA2-400.1 amplifier is designed for durability and requires minimal maintenance. However, following these guidelines will help ensure its longevity:
- Cleaning: Periodically clean the amplifier's exterior with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners. Ensure no dust or debris accumulates in the cooling fins.
- Connections: Occasionally check all power, ground, and speaker connections to ensure they are secure and free from corrosion. Loose connections can lead to poor performance or damage.
- Ventilation: Ensure that the amplifier's mounting location remains clear of obstructions to allow for proper airflow and heat dissipation.
- Fuse Replacement: If the external fuse blows, replace it only with a fuse of the same type and rating (30 Amps). A repeatedly blowing fuse indicates a problem that needs to be diagnosed.
7. Troubleshooting
If you experience issues with your MB Quart NA2-400.1 amplifier, consult the following table before seeking professional assistance:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power (Power LED Off) | Blown fuse; Loose power/ground connection; No remote turn-on signal. | Check and replace fuse; Verify all power and ground connections; Check remote wire connection and head unit output. |
| Protect LED On | Speaker short circuit; Overheating; Low voltage. | Check speaker wiring for shorts; Ensure adequate ventilation; Verify vehicle's battery voltage. |
| No Sound Output | RCA cables disconnected/faulty; Speaker wires disconnected/faulty; Gain set too low; Head unit issue. | Check RCA and speaker connections; Increase gain; Test head unit with another amplifier if possible. |
| Distorted Sound | Gain set too high; Improper crossover settings; Speaker impedance mismatch; Damaged speaker. | Reduce gain; Adjust LPF/Subsonic settings; Verify speaker impedance (2-Ohm or 4-Ohm); Inspect speaker for damage. |
| Weak Bass | Gain too low; LPF set too high; Subwoofer polarity reversed; Bass boost too low. | Increase gain; Adjust LPF lower; Check subwoofer wiring polarity; Increase bass boost slightly. |
8. Specifications
Detailed technical specifications for the MB Quart NA2-400.1 Compact Mono Powersports Amplifier:
| Class | Full Range Class D |
| Variable Voltage | 0.2V ~ 9V |
| Signal to Noise Ratio | >100dB |
| Frequency Response | 10Hz - 300Hz |
| Crossover Type | Electronic 12dB Per Octave |
| Crossover Frequency Range | Low Pass 300 Hz |
| Bass Boost | 0-12dB @ 45Hz |
| Subsonic Filter | 60Hz |
| Power @ 2-Ohms | 1 x 500W |
| Power @ 4-Ohms | 1 x 250W |
| Total Channels | Mono |
| Audio Inputs | RCA |
| Power Terminal | 12V/GND Molex 10 ga |
| Speaker Terminal Wire Gauge | Molex Plug Connector |
| Fusing | 1 x 30 Amps |
| Certifications | Marine & Powersports |
| Dimensions (L x W x H) | 5.51 x 3.70 x 1.77 inches (14.0 x 9.4 x 4.5 cm) |
| Weight | 2.09 lbs (0.95 kg) |
| Model Number | NA2-400.1 |
| ASIN | B06VT7XSYC |
9. Warranty and Support
MB Quart products are designed and manufactured to the highest quality standards. For information regarding warranty coverage, technical support, or service, please refer to the official MB Quart website or contact their customer service department. Keep your purchase receipt as proof of purchase for warranty claims.
What's in the Box:
- MB Quart NA2-400.1 Amplifier
- Quick Start Guide (This manual provides more detailed information)
- Remote Bass Control
