SKU: MA400.4

400-Watt RMS Full Range Class D 4-Channel Marine Amplifier

Availability: In stock

$579.95 MSRP

$529.95

Massive Power, Marine-Ready Design

Reliable full-range power in a marine-ready design. The MA400.4 from MTX delivers 100 watts RMS per channel with clean, balanced output and Class D efficiency. Built to perform in tough marine conditions, it features conformal coating, stainless steel hardware, and the same advanced protection and tuning controls you expect from MTX.

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Big Power in a Compact Design

The MA400.4 delivers 100 watts RMS per channel at 2Ω, pushing crisp, distortion-free sound through every speaker in your setup. Its compact footprint makes it easy to install without sacrificing performance. Each amp includes a Dyno Power Rating Certificate, confirming that you’re getting real, verified power.

Built for Harsh Conditions

Marine-specific upgrades make the MA400.4 a durable choice for life on the water. A conformal-coated circuit board protects against salt and moisture, while stainless steel hardware resists corrosion over time. It’s designed to stand up to the elements without compromising audio quality.

Efficient Power you can Rely On

With Class D circuitry, the MA400.4 runs cool and efficient even when pushed at high volume. Its surface mount component design keeps connections stable and secure, maintaining consistent output even in high-vibration environments.

Protection and Piece of Mind

Fine-tune your audio with variable gain and crossover settings, all hidden beneath a clean, low-profile panel. An LED indicator keeps you informed of power or protection status, monitoring for voltage issues or overheating so your system stays safe and sounding great.

Dimensions & Details

Dimensions

A - Length:

6 ³⁄₄” (171mm)
B - Width:

7” (178mm)
C - Depth:

2" (51mm)
Weight:

4.88Lbs (2.21Kg)

Features

Conformal Coated Circuit Board for Water & Salt Resistance
Stainless Steel Hardware to Prevent Corrosion
400 Watts RMS Power Output
Reliable Full-Range Class-D Circuit Design
Compact Size for Flexible Installation
10V High-Level Audio Input Compatibility
High-Quality Tiffany-Style RCA Input
Power and Protection LED Indicator Light
Surface Mount Component Technology
Direct Insert Power and Speaker Terminals
Thermal, Short, and Over/Under Voltage Protection
Clip Detection Light for Tuning Optimization
Dyno Power Rating Certificate

Ratings

CEA2006D compliant
RECOMMENDED FUSE RATING: 40A - 60A

CTA-2006-D Continuous Power Output:

100W RMS x 4 @ 2Ω, 1kHz, ≤1% THD+N

50W RMS x 4 @ 4Ω, 1kHz, ≤1% THD+N

200W RMS x 2 Bridged @ 4Ω, 1kHz, ≤1% THD+N

List of CTA-2006-D Certified 12 Volt Amplifiers

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SPECIFICATIONS

Description: 4-Channel
Topology: Full Range Class D
4Ω RMS Power Output: 50W x 4 Channels
2Ω RMS Power Output: 100W x 4 Channels
4Ω RMS Bridged Power Output : 200W x 2 Channels
THD: < 0.1%
Signal to Noise Ratio: > 98dB
Frequency Response: 20Hz - 20KHz
Crossover: 40Hz - 400Hz
Maximum Input Signal: 10V
Warranty Period: 24 months from date of purchase

Returns & Warranty

30-Day Money-Back Guarantee

At MTX Audio, we are serious about sound®. Therefore, if you are not "blown away" with your purchase, for any reason, you can return any items purchased directly from MTX.com that are complete and like new within 30 days. Products purchased from authorized MTX retailers must be returned through that same retailer. Products purchased through non-authorized MTX retailers may not be returned.

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Warranty Information

The warranty for MA400.4 is 24 months from the date of purchase.

MTX products purchased in the USA from an authorized MTX dealer are guaranteed against defects in material and workmanship for the period of time specified below, the warranty period begins the day the product is purchased by the end user. This warranty is limited to the original retail purchaser of product and extends only to products purchased from authorized MTX resellers. Product found to be defective during that period will be repaired or replaced by MTX at no charge.

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