NA2-400.2 Nautic 400 Watt Amplifier

MB Quart compact Two Channel, 400 watt Powersports amplifier.

$ 169.99
Temporarily sold out

SKU: 806576227342 Categories: ,

MB Quart compact Two Channel, 400 watt Powersports amplifier with on-board equalization and simple installation with quick release connectors.

Weight 2.12 lbs
Dimensions 6.8 × 3.93 × 1.77 in



MB Quart




Marine, Powersports






1 Year

Amp Class

Full Range Class D

Amp Total Channels


Amp Max Power (watts)


Amp Power @ 2 Ohms (ch x watts)

2 x 200

Amp Power @ 4 Ohms (ch x watts)

2 x 100

Amp Crossover


Amp Variable Low Pass Crossover 12dB per Octave

CH1 & CH2: 300Hz

Amp Bass Boost

0-12dB @ 45Hz

Amp Subsonic Filter


Amp Variable Voltage


Amp Signal to Noise

> 90dB

Amp Frequency Response


Amp Speaker Level Audio Inputs


Amp Power Terminal 12v/GND

Molex 10 GA

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
Marine Grade Protection / IPX Rating

Amplifiers are ASTM certified which defines that marine amplifiers must use conformal coated PC boards to resist corrosion from salt spray & moisture. IPX5

Low Noise Preamplifier Circuit

Q-Stasis Pre Amplifier Stage: The highly engineered Q-Stasis pre-amplifier stage reduces incoming noise from source units dramatically improving sound quality.

RCA Inputs

1 Pair RCA Nickel-Plated: High temperature impact resistant with hex screw terminals that allow for secure connections and is erosion resistant.

Operation Mode

Two channel operation: Flexible installation allows this amplifier to run in two channel or bridged mono mode.

Crossover Type

Switched FULL / 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 amplifer 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 dissapates heat to allow the amplifer 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 Dissconect Wires, RCA Connections: Quickly remove amplifer when you are putting machine up for the winter of as a security precaution.

Connection Type

Nickel-plated connections: Nickel plated corrosion resistant connections.

LED System Protection Circuitry Diagnostics

Three-stage protection circuits: Monitor thermal, overload, DC, and speaker short protection with lighted indicators on the amplifier end panel.

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MB Quart Nautic Amplifiers (NA2) Quick Start Guide (Rev3)