Description
MB Quart NA4-320.4 Nautic 4-Channel Marine & Powersports Amplifier
The MB Quart NA4-320.4 Nautic amplifier delivers reliable multi-channel power in a compact, marine-grade design. Built for harsh environments, this 4-channel Class D amplifier features fully potted internals and IP67-rated protection, ensuring dependable performance in marine and powersports applications where moisture, dust, and vibration are constant challenges.
Key Features
- 320 watts maximum output across four channels
- IP67 waterproof and dustproof construction
- Fully potted internal circuitry for long-term durability
- Q-Stasis low-noise preamp for improved audio clarity
- Quick-release power, speaker, and RCA connections
- Compact footprint for flexible installation
Marine-Grade Protection
Designed to meet or exceed IP67 standards, the Nautic amplifier is fully sealed against water and dust intrusion. Its potted internal components are insulated against moisture, preventing corrosion and electrical failure while enhancing long-term reliability in extreme outdoor environments.
Efficient Class D Performance
The full-range Class D topology provides high efficiency and strong output in a compact chassis. Combined with a PWM MOSFET power supply and Simpatico coil design, the amplifier maintains stable voltage delivery while minimizing heat generation.
Audio Control & Signal Integrity
The integrated Q-Stasis preamplifier reduces incoming noise from source units, improving overall sound quality. A fixed 80Hz high-pass crossover and wide 0.2–9V input sensitivity allow for flexible system integration and cleaner signal management.
Installation & Connectivity
The NA4-320.4 features nickel-plated, corrosion-resistant connections and quick-connect terminals for power, speakers, and RCA inputs. This design simplifies installation while ensuring secure, long-lasting connections in demanding environments.
Specifications
| Amplifier Type | 4-Channel Class D |
| Total Max Power | 320 Watts |
| Power @ 2 Ohms | 4 × 80W |
| Power @ 4 Ohms | 4 × 40W |
| Frequency Response | 13Hz – 29kHz |
| Signal to Noise Ratio | > 95dB |
| Total Harmonic Distortion | 1.0% |
| Input Sensitivity | 0.2V – 9V |
| Crossover | Fixed High Pass 80Hz |
| Inputs | 2 Pair RCA |
| Power Connection | 12 AWG Quick Connector |
| Speaker Connection | Molex Plug Connector |
| Fusing | 30A × 1 |
| IP Rating | IP67 |
| Application | Marine / Powersports |