Rockford Fosgate Prime Marine 400 Watt Full-Range Class-D 4-Chanel Amplifier - M400-4D

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The M400-4D is a 400 Watt 4-channel high efficiency Class-D marine amplifier featuring a Marine grade PC Board, on-board Punch EQ, variable crossover and tri-state protection circuits.


The Prime M400-4D amplifier is a 400 Watt 4-channel high efficiency Class-D amplifier specifically designed for Marine and Powersport applications. The amplifier features a Marine grade PC Board, and the Class-D circuit topology is so efficient, it consumes much less current from your charging system over traditional Class-A/B amplifiers.

  • 12dB/octave Butterworth crossover
  • 2/4 channel input switch
  • 4 Gauge power/ground connectors
  • Cast aluminum heatsink
  • Top mounted controls
  • Marine grade 2-part epoxy coated PCB
  • On-board Punch EQ with +18dB boost @ 45Hz
  • Tri-stage protection covers thermal, over-current and short circuits.
  • 2-Year Warranty


CE Compliant

This product fulfills all essential safety and environmental requirements as defined in the European Directives (768/2008 EC).

Element Ready™ - Amps

These amplifiers are protected against Dust, UV, Corrosion, and feature Stainless hardware.

Full Range Class-D

A full-range version of the Class-D topology which is a high efficiency amplifier design that reduces current consumption from the charging system.


Power ratings on Rockford Fosgate amplifiers conform to CEA-2006 industry standards. These guidelines mean your amplifier's output power ratings are REAL POWER numbers, not inflated marketing ratings.

Remote Controlsn/a
Heat Sink TypeCast Aluminum
Signal OutputLow Level: 1 RCA Pair
Tone Controls0dB to +18dB @ 45Hz
Crossover ControlsFront Channels: Variable 50Hz - 500Hz @ 12dB/octave
Rear Channels: Variable 50Hz - 500Hz @ 12dB/octave
Rated Power (RMS Continuous Power)  75 Watts x 4 @ 4-Ohm
100 Watts x 4 @ 2-Ohm
200 Watts x 2 @ 4-Ohm Bridged
Dynamic Power (PVC/PowerCube®)  79 Watts x 4 @ 4-Ohm
138 Watts x 4 @ 2-Ohm
255 Watts x 2 @ 4-Ohm Bridged
Circuit Topology ClassFull-Range Class D
Frequency Response20Hz to 20kHz +/-1dB
Speaker Wire Gauge12 AWG
Speaker Output ConnectorBlock
Power Input ConnectorBlock
Power Wire Gauge4 AWG
Signal InputLow Level: 2 RCA Pair
Number of Channels4
Visual IndicatorsPower
Dimensions (H x W x D)1.97" x 6.77" x 9.10"
(5cm x 17.20cm x 23.10cm)
Shipping Weight5.863 Lbs.
(2.65 Kg.)
Efficiency (average)80% @ 4-Ohm
75% @ 2-Ohm
Total Power (Sum of Rated Power)400 Watts RMS

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