Description
Overview
The MB Quart NA4-400.2 Nautic is a compact 2-channel powersports and marine amplifier engineered for high performance in harsh environments. With a total output of 400 watts and a highly efficient Class D design, it delivers strong, reliable power while maintaining a compact footprint.
Built with waterproof potted internals and IP67-rated protection, this amplifier is designed to withstand exposure to water, dust, and extreme conditions without compromising performance.
Key Features
- 400W max 2-channel amplifier for marine and powersports applications
- IP67 waterproof and dustproof design with fully potted internal components
- Q-Stasis low-noise preamp circuit for improved signal clarity
- Quick-connect power, speaker, and RCA connections for faster installation
- Integrated protection circuitry with LED diagnostic indicators
Engineering & Protection
The Nautic series amplifier features fully potted internals that seal and protect sensitive electronics from moisture, vibration, and environmental exposure. Combined with an IP67 rating, it meets the demands of marine and off-road environments.
A PWM MOSFET power supply and aluminum heatsink design ensure stable output with efficient heat dissipation, allowing the amplifier to perform consistently under load.
Audio Performance & Tuning
Equipped with a Q-Stasis low-noise preamplifier circuit, the NA4-400.2 minimizes incoming signal noise to deliver cleaner audio output. Variable high-pass and low-pass crossovers provide flexible system tuning for a wide range of speaker configurations.
With a wide frequency response and strong signal-to-noise performance, this amplifier supports detailed, full-range sound reproduction in demanding environments.
Installation & Connectivity
Designed for ease of installation, the amplifier features quick-connect power and signal terminals along with corrosion-resistant nickel-plated connections. The compact chassis allows for flexible mounting in tight spaces common to marine and powersports applications.
Specifications
| Model | NA4-400.2 |
|---|---|
| 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 | 6Hz – 29kHz |
| Signal to Noise Ratio | >105 dB |
| Total Harmonic Distortion | 1.0% |
| High Pass Crossover | 15Hz – 300Hz (12 dB/Octave) |
| Low Pass Crossover | 50Hz – 300Hz (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.