Description
Overview
The MB Quart NA4-400.2RC Nautic is a compact 2-channel amplifier designed for marine and powersports applications, featuring direct compatibility with Polaris® RIDE COMMAND® systems. Built to deliver reliable performance in harsh environments, it combines efficient Class D power with a rugged, waterproof design.
With 400 watts of total output, this amplifier is engineered for clean, consistent power delivery while maintaining a compact footprint ideal for tight installation spaces.
Key Features
- 400W max 2-channel amplifier with Polaris® RIDE COMMAND® compatibility
- IP67-rated waterproof and dustproof construction with fully potted internals
- Fixed 80Hz high-pass crossover for simplified system tuning
- Q-Stasis low-noise preamp for improved signal clarity
- Quick-connect power, speaker, and RCA connections for easy installation
Engineering & Protection
Designed for extreme environments, the NA4-400.2RC features fully potted internal components that seal out moisture, dust, and contaminants. This construction, combined with an IP67 rating, ensures long-term durability in marine and off-road applications.
A PWM MOSFET power supply and aluminum heatsink design provide efficient power delivery and effective heat dissipation, allowing the amplifier to maintain performance under demanding conditions.
Audio Performance
The integrated Q-Stasis preamplifier circuit reduces incoming signal noise, helping deliver cleaner and more detailed sound. With a frequency response of 80Hz to 20kHz and a signal-to-noise ratio greater than 105 dB, this amplifier is optimized for midrange and high-frequency speaker systems.
A fixed 80Hz high-pass crossover helps protect connected speakers while simplifying system setup.
Installation & Connectivity
The compact chassis and quick-connect terminals make installation fast and efficient. The amplifier uses corrosion-resistant nickel-plated RCA inputs and connectors, ensuring secure and reliable connections in demanding environments.
Integrated protection circuitry monitors thermal, overload, DC, and speaker short conditions, with LED indicators providing real-time system status.
Specifications
| Model | NA4-400.2RC |
|---|---|
| Channels | 2 |
| Amplifier Class | Class D (Full Range) |
| Max Power | 400W |
| Power @ 4 Ohms | 2 x 100W |
| Power @ 2 Ohms | 2 x 200W |
| Frequency Response | 80Hz – 20kHz |
| Signal to Noise Ratio | >105 dB |
| Total Harmonic Distortion | 1.0% |
| High Pass Crossover | Fixed 80Hz (12 dB/Octave) |
| Input Sensitivity | 0.2V – 9V |
| IP Rating | IP67 |
| Fuse Rating | 30A x 1 |
Used Frequently Asked Questions
- What does used mean? Used products may be unused customer returns that are essentially "new" items, or they may be previously installed products that were returned under warranty or during our return policy period.
- What is the warranty? All of our used items come with a 90-day warranty.
- What's it look like? All of our used items are inspected and graded by our returns team at our facilities. They will test them and grade them to one of four standard gradings: Used Open Box, Used Very Good, Used Good, and Used Acceptable. Please see the following descriptions of each grade - also note that if an item falls under ANY of the criteria for a certain grade, even though the rest of the product is better, we will give it the lowest grade.
- Used Open Box An item in perfect working condition. Original protective wrapping may be missing, but the original packaging is intact and in good condition with minor damage possible. Instructions are included.
- Used Very Good A well-cared-for item with limited use, remains in good working condition. The item may show some limited signs of wear,small scratches,cosmetic blemishes. Item may arrive with damaged packaging or be repackaged and could be missing some accessories.
- Used Good The item shows wear from use, remains in good condition and functions properly. May have damaged packaging or be repackaged. It may be marked, have identifying markings on it, have minor cosmetic damage. It may be missing some parts or accessories.
- Used Acceptable The item is fairly worn but continues to function properly. While repackaged; signs of wear can include aesthetic issues; scratches, dents. The item may have markings on it or show signs of previous use. Item may be missing some parts or accessories.
- Have more questions? Call us, send us a chat, or an email. We'll be able to answer any additional questions you may have.