Description
Compact Marine-Grade Mono Amplifier
The MB Quart NA4-400.1 Nautic amplifier is a compact, high-efficiency mono amplifier designed for marine and powersports applications. Built to deliver reliable subwoofer power in harsh environments, it combines durable construction with consistent performance in a small footprint.
With 400 watts of maximum output and a highly efficient Class D topology, this amplifier is ideal for systems where space is limited but dependable bass output is required.
Marine-Grade Protection
Engineered to meet or exceed IP67 standards, the NA4-400.1 is fully protected against water and dust intrusion. Its potted internal design seals critical components, preventing moisture-related damage such as corrosion or short circuits.
This rugged construction makes it suitable for boats, UTVs, motorcycles, and other exposed environments.
Performance & Signal Control
- Mono amplifier configuration for subwoofer applications
- Variable low-pass crossover: 50Hz–150Hz (12 dB/octave)
- Adjustable subsonic filter: 15Hz–50Hz
- Bass boost: 0–12 dB
- Input sensitivity: 0.2V–9V
- Signal-to-noise ratio greater than 100 dB
The integrated Q-Stasis preamplifier circuit minimizes noise from incoming signals, improving overall sound clarity.
Advanced Engineering
Utilizing a PWM MOSFET power supply and Simpatico coil design, the amplifier maintains stable voltage and efficient power delivery. The aluminum heatsink helps dissipate heat quickly, supporting consistent operation even under demanding conditions.
Its full-range Class D design ensures high efficiency while keeping size and heat generation to a minimum.
Installation & Connectivity
Designed for convenience, the amplifier features quick-release connectors for power, speaker, and RCA inputs, making installation and removal simple. Nickel-plated connections provide corrosion resistance and long-term reliability.
A wired bass remote is included, allowing easy adjustment of output levels from a convenient location within the vehicle.
Protection & Diagnostics
Integrated protection circuitry monitors thermal conditions, overload, DC offset, and speaker shorts. LED indicators on the amplifier provide real-time diagnostic feedback for system status and protection events.
Specifications
| Model | NA4-400.1 |
| Series | Nautic |
| Amplifier Type | Mono |
| Amplifier Class | Class D (Full Range) |
| Max Power | 400 watts |
| Power @ 2 Ohms | 1 x 400 watts |
| Power @ 4 Ohms | 1 x 200 watts |
| Frequency Response | 17Hz–165Hz |
| Signal-to-Noise Ratio | > 100 dB |
| Total Harmonic Distortion | 1.0% |
| Low Pass Crossover | 50Hz–150Hz |
| Subsonic Filter | 15Hz–50Hz |
| Bass Boost | 0–12 dB |
| Input Sensitivity | 0.2V–9V |
| IP Rating | IP67 |
| Fusing | 30A x 1 |