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MB Quart NA2-400.2

400W Peak Class D Nautic Series Compact 2-Channel Marine and Powersports Amplifier

MB Quart
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• 100 watts x 2 channel @ 4 ohm
• 200 watts x 2 channel @ 2 ohm
• Total Power: 400 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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Product Highlights


• 100 watts x 2 channel @ 4 ohm
• 200 watts x 2 channel @ 2 ohm
• Total Power: 400 watts
• Class D 2 ohm Stable 2-Channel Amplifier

Description


MB Quart brand icon

Authorized dealer


MB Quart NA2-400.2

The MB Quart NA2-400.2 is a compact, marine-grade Class D 2-channel amplifier designed for powerful, reliable performance in harsh outdoor environments. Delivering up to 200 watts per channel at 2 ohms (400 watts total), it features IPX5 protection, conformal-coated circuitry, and corrosion-resistant terminals to withstand moisture and salt spray. Its advanced Q-Stasis pre-amp stage, PWM MOSFET power supply, and adjustable high- and low-pass filters provide clean, customizable sound, while built-in thermal, overload, and short-circuit protection ensure long-term durability. With flexible two-channel or bridged operation, quick-disconnect wiring, and a rugged aluminum heat sink, the NA2-400.2 is engineered for efficient, low-heat performance in boats, powersports vehicles, and other demanding installations.


Product Details:

  • Nautic Series Class D 2 ohm Stable 2-Channel Amplifier
  • RMS Power Rating:
    • 4 ohm: 100 watts x 2 channel
    • 2 ohm: 200 watts x 2 channel
  • Total power output: 400 watts
  • LED power (blue) and protect (red) light indicator
  • Signal sensing remote turn-on
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • IPX5 marine grade protected and ASTM certified
  • Uses conformal coated PC boards to resist corrosion from salt spray and moisture
  • Highly engineered Q-Stasis pre-amplifier stage reduces noise from stereos
  • High temperature impact resistant with hex screw terminals
  • Allows amplifier to run in two channel or bridged mono mode
  • Complete control of amplifier signal, essential when using two or more amplifiers
  • Integrated PWM MOSFET power supply
  • Stable power through the PC board with minimal heat generation
  • Aluminum heat sink to quickly dissipate heat
  • Dual Simpatico coil Pulse Width Modulated power supply
  • Quick disconnect wires and RCA connections
  • Nickel plated corrosion resistant connection type
  • Low level input sensitivity: 0.2 - 9 volts
  • Frequency Response: 20 - 20000 Hz
  • Signal to Noise Ratio: 90 dB
  • Variable high-pass filter: 15 - 300 Hz
  • Variable low-pass filter: 50 - 300 Hz
  • Fuse Rating: 30A
  • 10 AWG gauge amplifier wiring kit is recommended for installation
  • Dimensions: 3.70" L x 5.51" W x 1.77" H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty
  • MFR #: NA2-400.2
PDF icon for MB Quart NA2-400.2 owner's manual MB Quart NA2-400.2 owner’s manual

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Specifications & Details


Key Features
Amplifier Key Features
Compact Design
Weather-Resistant
Power Specifications - Full Range Channels
Peak Power @ 4 ohms
100 watts x 2 channel
Peak Power @ 2 ohms
200 watts x 2 channel
Amplifier Specifications
Series
Nautic Series
Amplifier Class
D
Number of Channels
2-Channel
Total Peak Power Output
400 watts
Maximum Input Gauge Size
10 AWG
Minimum Impedance Unbridged
2 ohm
Minimum Impedance Bridged
Not Bridgeable
Frequency Response
20 - 20000 Hz
Speaker Level Inputs
No
Preamp Outputs
No
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
High-Pass Crossover Frequency
15 - 300 Hz
Low-Pass Crossover Frequency
50 - 300 Hz
Signal-to-Noise Ratio
90 dB
Remote bass/level controller
No
Fuse Rating
30A x 1 
Total Fuse Rating
30
Strappable
No
Amp Bluetooth Connectivity
No
Hi-Res Certified
No
Low-Level Input Sensitivity
0.2 - 9 volts
What is in the box?
Paperwork
Quick start guide
WITB: Amplifiers
Amplifier
Mounting screws (4)
High-level input wiring harness w/ molex connector
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

NA2-400.2

Weight:

2.12lbs

Internal SKU:

na24002

Internal Product ID:

128347

Product and How-to Videos


Customer Ratings & Reviews


MB Quart NA2-400.2 thumbnail image

5 star
86%
4 star
14%
3 star
0%
2 star
0%
1 star
0%



Durability
4.9
Value
5
Features
4.5
Design
4.9
Usability
4.9

Customer Photos & Videos


Customer Reviews

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Good Amp for Powering Woofers in my 2000 Porsche Boxster

I'm using this unit to power two 6.5-inch woofers that I installed in the doors of my Porsche Boxster. After about a month of use, I'm pleased with the sound quality. The small size made it easy to find a place to mount it in the front trunk.

By Kevin on July 16, 2022 Checkmark Icon Verified purchase

99 found this helpful


Great product

I would recommend this to anyone looking for a small but powerful amp. I paired this with 2 6x9's and the sound is amazing.

By James on November 11, 2017

40 found this helpful


Yes All the way!!!

Ive been installing since 14yrs old. I am 50 now. I've always love small kick ass and cheater amps but I truly love plain and straight 2 and 4 channel anps. Ive been around Adcom, USamps, Zapco, Audiocontrol and Denon.This amp is pure love affair. Price and size and quality. My son is an Eagle Scout lots of camping fishing and outdoors stuff using my car and leaving my soun roof open leaves moisture inside but so what its marine grade I WIN. I even got a 5 channel for his car. I might just buy more to install in my garage. I love it so much!!!!

By Anonymous on October 7, 2019 Checkmark Icon Verified purchase

38 found this helpful


Awesome product

I replaced a brand new MTX mud100.2 that was near the same wattage and weighed 1/2 as much for the same size. This thing is 100% as pure as it advertises

By curtis on July 20, 2020 Checkmark Icon Verified purchase

32 found this helpful


Packs a Punch

Clean sounding small amp. No distortion or engine noise. It does get warm, but not hot. Currently using it to run two 8" subwoofers and a set of tweeters under the back seat of my Dodge Ram truck. Good bass. Nice balanced sound, when using the High Pass (HP) switch option and dial setting about 1/3 up. It complements well with the MB Quart 6x9 speakers in the doors. Highly recommend.

By ensoniqman on July 15, 2021

29 found this helpful


crazy small

running both channels on 2 ohms. This amp screams! using it in my SXS and it was really easy to hide.

By Daniel on November 24, 2025 Checkmark Icon Verified purchase


By Jeremy on April 5, 2025 Checkmark Icon Verified purchase




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