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MB Quart - NA4-400.2 Nautic 400 Watt Waterproof 2-Channel Amplifier 100x2 @ 4OHM, 200x2 @ 2OHM - Black/Gray

Model: NA4-400.2
SKU: 12357564

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$219.99
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4.91(11)
Specifications
  • Amplifier Class
    D
    Number Of Channels
    2
    Bass Boost
    Variable
  • Key Specs
    • Amplifier Class: D (An amplifier's mode of operation, specifically the conditions in which its electrical current flows for the duration of an audio signal, determines its class. Each class has its strengths and weaknesses when it comes to power efficiency, levels of crossover distortion, and overall sound quality.)
    • Number Of Channels: 2
    • Bass Boost: Variable (Circuitry that boosts the bass response of the amplifier, improving audio reproduction enhancing the sound of low frequencies. Fixed boost means the level of bass response is preset, whereas variable boost allows the user to make adjustments.)
  • General
    • Brand: MB Quart
    • Model Number: NA4-400.2
    • Product Name: MB Quart NA4-400.2 Nautic 400 Watt Waterproof 2-Channel Amplifier 100x2 @ 4OHM, 200x2 @ 2OHM
    • Color: Black/Gray
  • Audio Power
    • Total Power Handling RMS: 200 watts
    • Total Power Handling Maximum: 400 watts
    • Amplifier Class: D (An amplifier's mode of operation, specifically the conditions in which its electrical current flows for the duration of an audio signal, determines its class. Each class has its strengths and weaknesses when it comes to power efficiency, levels of crossover distortion, and overall sound quality.)
  • Audio
    • Number Of Channels: 2
    • Bass Boost: Variable (Circuitry that boosts the bass response of the amplifier, improving audio reproduction enhancing the sound of low frequencies. Fixed boost means the level of bass response is preset, whereas variable boost allows the user to make adjustments.)
  • Features
    • Bluetooth Enabled: false (The device is capable of communicating with another device via Bluetooth, provided they are within the required range of each other. A Bluetooth-enabled device must also be the same Bluetooth version or higher than the accessory it is intended to pair with.)
    • Marine: true
  • Dimensions
    • Product Height: 17.000 inches (The out of box height of the item. Height is measured as the vertical distance from the bottom of the item to the top as it would be primarily used or placed.)
    • Product Width: 16.000 inches (The out of box width of the item. Width is measured as the horizontal distance from one side of the item to the other as it would be primarily used or placed.)
    • Product Depth: 10.000 inches (The out of box depth of the item. Depth is measured as the distance from the front of the item to the back as it would be primarily used or placed.)
    • Product Weight: 3.0 pounds (The out of box weight of the item.)
  • Warranty
    • Warranty - Parts: 1-Year Manufacturer Warranty
    • Warranty - Labor: None
  • Other
    • UPC: 806576238225

The MB Quart NA4-400.2 Nautic is a compact 2-channel amplifier engineered for reliable, high-output performance in marine and powersports environments. Built around a highly efficient Class D topology, it delivers up to 400 watts of total power while maintaining a small footprint that fits easily into tight installation spaces. Designed for harsh conditions, the amplifier features IP67-rated protection along with fully potted internals. This sealing process protects critical components from water, dust, vibration, and corrosion, making it ideal for boats, UTVs, and other outdoor applications where durability is critical. An aluminum heatsink further improves thermal management, allowing the amplifier to perform consistently under load. On the audio side, MB Quart’s Q-Stasis low-noise preamp circuit helps reduce incoming signal noise, improving clarity across the entire frequency range. With a response of 6Hz to 29kHz and a signal-to-noise ratio greater than 105 dB, the NA4-400.2 is capable of clean, full-range sound reproduction. Variable high-pass and low-pass crossovers (12 dB/octave) provide flexible tuning, making it easy to dial in performance for a wide range of speaker setups. Installation is streamlined with quick-connect power, speaker, and RCA terminals, along with corrosion-resistant nickel-plated connections. Integrated protection circuitry monitors thermal, overload, DC, and speaker faults, with LED indicators for system diagnostics. 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 (THD): 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

  • Key Feature: 2-channel Class D amplifier rated at 400W max total power with 2 x 100W @ 4Ω and 2 x 200W @ 2Ω output
  • Key Feature: IP67-rated marine/powersports design with fully potted internals for waterproof, dustproof durability
  • Key Feature: Variable crossovers with 12 dB/octave slopes: HPF (15Hz–300Hz) and LPF (50Hz–300Hz) for flexible system tuning
  • Key Feature: Wide frequency response of 6Hz–29kHz with >105 dB signal-to-noise ratio for clean, full-range audio performance
  • Key Feature: Compact chassis with quick-connect power, speaker, and RCA connections for simplified installation
Whats Included
  • MB Quart NA4-400.2 Nautic 400 Watt Waterproof 2-Channel Amplifier 100x2 @ 4OHM, 200x2 @ 2OHM
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MB Quart - NA4-400.2 Nautic 400 Watt Waterproof 2-Channel Amplifier 100x2 @ 4OHM, 200x2 @ 2OHM - Black/Gray
MB Quart - NA4-400.2 Nautic 400 Watt Waterproof 2-Channel Amplifier 100x2 @ 4OHM, 200x2 @ 2OHM - Black/Gray

The MB Quart NA4-400.2 Nautic is a compact 2-channel amplifier engineered for reliable, high-output performance in marine and powersports environments. Built around a highly efficient Class D topology, it delivers up to 400 watts of total power while maintaining a small footprint that fits easily into tight installation spaces. Designed for harsh conditions, the amplifier features IP67-rated protection along with fully potted internals. This sealing process protects critical components from water, dust, vibration, and corrosion, making it ideal for boats, UTVs, and other outdoor applications where durability is critical. An aluminum heatsink further improves thermal management, allowing the amplifier to perform consistently under load. On the audio side, MB Quart’s Q-Stasis low-noise preamp circuit helps reduce incoming signal noise, improving clarity across the entire frequency range. With a response of 6Hz to 29kHz and a signal-to-noise ratio greater than 105 dB, the NA4-400.2 is capable of clean, full-range sound reproduction. Variable high-pass and low-pass crossovers (12 dB/octave) provide flexible tuning, making it easy to dial in performance for a wide range of speaker setups. Installation is streamlined with quick-connect power, speaker, and RCA terminals, along with corrosion-resistant nickel-plated connections. Integrated protection circuitry monitors thermal, overload, DC, and speaker faults, with LED indicators for system diagnostics. 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 (THD): 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

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