MB Quart Nautic/Offroad 400-Watt Waterproof 2 Channel Amplifiers
The MB Quart Nautic/Offroad NA4-400.2 and NA4-400.2RC 400-Watt 2 Channel Amplifiers are engineered to deliver powerful and reliable sound for marine and off-road audio systems. These compact powersports amplifiers feature waterproof potted internals and quick-release connectors, making them ideal for harsh riding environments where moisture, dust, and vibration are common. Built with efficient full-range Class D technology and a durable aluminum heatsink, both models provide strong audio performance while maintaining a compact footprint for easy installation.
Designed for durability and clean sound output, both amplifiers feature MB Quart’s Q-Stasis low-noise preamplifier circuit that reduces unwanted signal noise from the source unit. They meet or exceed IP67 waterproof and dustproof standards and include corrosion-resistant nickel-plated RCA inputs, quick-connect wiring, and integrated LED protection diagnostics. The NA4-400.2RC version also adds compatibility with the Polaris RIDE COMMAND source unit, making it an excellent upgrade option for Polaris vehicles equipped with that system.
Features
NA4-400.2 Nautic 400 Watt Waterproof 2 Channel Amplifier
- Marine Grade Protection / IPX Rating: Meets or exceeds IP67 standards for waterproof and dustproof. Potted Internals: The potting material seals the components, insulating them and ensuring better durability, especially in harsh environments where exposure to moisture or water might otherwise cause short circuits, corrosion, or other performance issues
- Low Noise Preamplifier Circuit: The highly engineered Q-Stasis pre-amplifier stage reduces incoming noise from source units dramatically improving sound quality
- RCA Inputs: 1 pair high temperature impact resistant nickel-plated RCA inputs that allow for secure connections and are corrosion resistant
- Operation Mode: Two channel operation
- Crossover Type: Dial Switch OFF / LPF / HPF: Complete control of amplifier signal, essential when using two or more amplifiers
- Class / Topology: Full Range Class D: Highly efficient circuit topology which helps the amplifier develop a lot of power in a very small heatsink
- Output Device Technology: PWM MOSFET Power Supply: Stable power through the PC board with minimal heat generation
- Heat Sink: Aluminum: Quickly dissipates heat to allow the amplifier to run lower impedance for longer duration
- Power Supply: Simpatico Coil Design: The dual coil Pulse Width Modulated power supply keeps voltage constant through the Ultra-Fi output devices
- Output Connections: Quick Connection Power Wires and RCA Connections
- Connection Type: Nickel-plated connections: Nickel plated corrosion resistant connections
- LED System Protection Circuitry Diagnostics: Protection circuits: Monitor thermal, overload, DC, and speaker short protection with lighted indicators on the amplifier end panel
NA4-400.2RC Nautic 400 Watt Waterproof 2 Channel Amplifier (Polaris RIDE COMMAND Compatible)
- Marine Grade Protection / IPX Rating: Meets or exceeds IP67 standards for waterproof and dustproof. Potted Internals: The potting material seals the components, insulating them and ensuring better durability, especially in harsh environments where exposure to moisture or water might otherwise cause short circuits, corrosion, or other performance issues
- Low Noise Preamplifier Circuit: The highly engineered Q-Stasis pre-amplifier stage reduces incoming noise from source units dramatically improving sound quality
- RCA Inputs: 1 pair high temperature impact resistant nickel-plated RCA inputs that allow for secure connections and are corrosion resistant
- Operation Mode: Two channel operation
- Crossover Type: Fixed HPF
- Class / Topology: Full Range Class D: Highly efficient circuit topology which helps the amplifier develop a lot of power in a very small heatsink
- Output Device Technology: PWM MOSFET Power Supply: Stable power through the PC board with minimal heat generation
- Heat Sink: Aluminum: Quickly dissipates heat to allow the amplifier to run lower impedance for longer duration
- Power Supply: Simpatico Coil Design: The dual coil Pulse Width Modulated power supply keeps voltage constant through the Ultra-Fi output devices
- Output Connections: Quick Connection Power Wires and RCA Connections
- Connection Type: Nickel-plated connections: Nickel plated corrosion resistant connections
- LED System Protection Circuitry Diagnostics: Protection circuits: Monitor thermal, overload, DC, and speaker short protection with lighted indicators on the amplifier end panel
Specifications
NA4-400.2 Nautic 400 Watt Waterproof 2 Channel Amplifier
- Color: Black
- Model Replaced: NA2-400.1
- Warranty: 1 Year
- IPX Rating: IP67
- Compatible Vehicles: Universal
- Amp Class: Full Range Class D
- Amp Total Channels: Mono
- Amp Max Power (watts): 400
- Amp Power @ 2 Ohms (ch x watts): 1 x 400
- Amp Power @ 4 Ohms (ch x watts): 1 x 200
- Amp Crossover: Electronic
- Amp Variable Low Pass Crossover 12dB per Octave: 50Hz-150Hz
- Amp Bass Boost: 0-12dB
- Amp Subsonic Filter: 15Hz-50Hz
- Amp Variable Voltage: 0.2-9V
- Amp Signal to Noise: > 100dB
- Amp Frequency Response: 17Hz-165Hz
- Amp Total Harmonic Distortion (THD): 1.0%
- Amp Speaker Level Audio Inputs: RCA
- Amp Power Terminal 12v/GND: 12 AWG Quick Connector
- Amp Speaker Terminal Wire Gauge: Molex Plug Connector
- Amp Fusing: 30A x 1
- Proposition 65 Notice WARNING: This product can expose you to chemicals including LEAD, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
NA4-400.2RC Nautic 400 Watt Waterproof 2 Channel Amplifier (Polaris RIDE COMMAND Compatible)
- Color: Black
- Model Replaced: NA2-400.2RC
- Warranty: 1 Year
- IPX Rating: IP67
- Compatible Vehicles: Universal
- Amp Class: Full Range Class D
- Amp Total Channels: 2
- Amp Max Power (watts): 400
- Amp Power @ 2 Ohms (ch x watts): 2 x 200
- Amp Power @ 4 Ohms (ch x watts): 2 x 100
- Amp Variable High Pass Crossover 12dB per Octave: Fixed HP 80Hz
- Amp Variable Voltage: 0.2-9V
- Amp Signal to Noise: > 105dB
- Amp Frequency Response: 80Hz-20kHz
- Amp Total Harmonic Distortion (THD): 1.0%
- Amp Speaker Level Audio Inputs: RCA
- Amp Power Terminal 12v/GND: 12 AWG Quick Connector
- Amp Speaker Terminal Wire Gauge: Molex Plug Connector
- Amp Fusing: 30A x 1
- Proposition 65 Notice WARNING: This product can expose you to chemicals including LEAD, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Fitment
- Universal
- NA4-400.2RC Nautic 400 Watt Waterproof 2 Channel Amplifier compatible with Polaris RIDE COMMAND
MB Quart (About)
MB Quart is a leader in premium audio systems for powersports, delivering crystal-clear sound in the most rugged environments. With a focus on durability and performance, their products are built to withstand the elements while providing powerful, high-quality audio for UTV enthusiasts. Whether on trails, dunes, or mud, MB Quart ensures you experience the best soundtrack for every offroad adventure.