MB Quart - NA4-320.4 Nautic 320 Watt Waterproof 4 Channel Amplifier 40x4 @ 4OHM, 80x4@2OHM - Black/Gray

The MB Quart NA4-320.4 Nautic amplifier is engineered to deliver reliable, high-efficiency performance in demanding marine and powersports environments. Designed with a compact footprint and rugged construction, this 4-channel Class D amplifier produces 160 watts of RMS output, making it ideal for powering full-range speaker systems in outdoor vehicles. Built to meet IP67 standards, the NA4-320.4 is fully waterproof and dustproof, ensuring dependable operation in wet and harsh conditions. Its potted internal circuitry provides an added layer of protection by sealing sensitive components against moisture, vibration, and corrosion. This design significantly enhances long-term durability and system reliability where traditional amplifiers would fail. Performance is equally prioritized with MB Quart’s Q-Stasis low-noise preamp circuit, which minimizes unwanted signal interference and improves overall audio clarity. The amplifier also features a highly efficient PWM MOSFET power supply with Simpatico coil design, maintaining stable voltage while reducing heat buildup. A fixed 80Hz high-pass crossover allows for proper speaker protection and system tuning, while the wide 0.2V–9V input sensitivity ensures compatibility with a variety of source units. Installation is streamlined thanks to quick-connect power, speaker, and RCA terminals, along with nickel-plated, corrosion-resistant connections that maintain signal integrity over time. Integrated protection circuitry monitors thermal, overload, DC, and short conditions, providing peace of mind during extended use. Specifications: Type: 4-Channel Class D Amplifier Max Power: 320 Watts Power @ 2 Ohms: 4 x 80W Power @ 4 Ohms: 4 x 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 x 1 IP Rating: IP67