MB Quart NA2-400.2

400W Peak NA2 Series Class-D 2-Channel 2-Ohm Stable Amplifier

MB Quart
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• 100 Watts RMS x 2 @ 4 ohms
• 200 Watts RMS x 2 @ 2 ohms
• Total Peak Power: 400 Watts
• Marine and Powersports Certified
• Built-In Low-Pass and Hi-Pass Filters
• Aluminum Heatsink
• Dimensions: 3.7" W x 5.51" L x 1.77"

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General Features:

  • MB Quart NA2-400.2
  • Class-D Full Range 2-Ohm Stable 2-Channel Amplifier
  • Ultra Compact design built for powersports applications
  • Marine and powersports certified
  • RMS Power Rating:
    • 4 ohms: 100 watts x 2chan.
    • 2 ohms: 200 watts x 2 chan.
  • Total power output: 400 watts
  • Pulse Width Modulated MOSFET power supply
  • Wired remote bass level control included
  • LED power (green) and protect (red) indicators
  • Soft start turn-on
  • Mono channel operation
  • Speaker-level (high-level) inputs
  • Preamp RCA outputs to daisy chain multiple amps
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Dual speaker terminals simplify the hookup of multiple speakers
  • Heavy duty aluminum alloy heat-sink
  • Frequency Response: 20 - 20,000 Hz
  • Signal to Noise Ratio: >90dB
  • Variable high-pass filter: 15 - 300 Hz, 12 dB/octave
  • Variable low-pass filter: 50 - 300 Hz, 12 dB/octave
  • Fuse Rating: 30 A x 1
  • 10 gauge power and ground wiring is recommended for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier. Click Here for our contact information.
  • Dimensions: 3.7"W x 5.51"L x 1.77"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty
MB Quart NA2-400.2 owner’s manual

Specifications & Details

Power Specifications - Subwoofer Channel
RMS Power @ .5 ohm
Power Specifications - Full Range Channels
Peak Power @ 4 ohms
100 watts x 2 channel
Peak Power @ 2 ohms
200 watts x 2 channel
Power Specifications - Subwoofer Channel
Peak Power @ .5 ohm
Amplifier Specifications
Marine Certified
Amplifier Class
Number of Channels
Total Peak Power Output
400 watts
Maximum Input Gauge Size
10 AWG
Minimum Impedance Unbridged
2 ohms
Minimum Impedance Bridged
2 ohms
Frequency Response
Speaker Level Inputs
Preamp Outputs
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
Fuse Rating
30A x 1 
CEA-2031 Compliant
Sonic Certified Amplifier
Amp Bluetooth Connectivity
Hi-Res Certified
Low-Level Input Sensitivity
High-Level Input Sensitivity
What is in the box?
User manual
WITB: Amplifiers
Other Accessory #6
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details


Model Number:




Internal SKU:


Internal Product ID:


Customer Ratings & 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 checkmarkIcon Verified purchase


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


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 checkmarkIcon Verified purchase


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 checkmarkIcon Verified purchase


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


found this helpful.


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