Rockford Fosgate M4004D 400 Watt Full-Range Class-D 4-Chanel Amplifier

SKU M4004D



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400 Watt Full-Range Class-D 4-Chanel Amplifier

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.

  • 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.
  • 1 Year Standard Warranty warranty info
Element Ready - Amps

Element Ready – Amps

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



Power ratings on Rockford Fosgate amplifiers conform to CEA-2006 industry standards. These…

CE Compliant

CE Compliant

This product fulfills all essential safety and environmental requirements as defined in the…

Full Range Class-D

Full Range Class-D

A full-range version of the Class-D topology which is a high efficiency amplifier design that…

CEA-2006 Compliant: CEA-2006 Power Rating
75W x 4 @ 4Ω
≤1.0% THD+N
Number of Channels: 4
Rated Power 
(RMS Continuous Power):
  75 Watts x 4 @ 4-Ohm 
100 Watts x 4 @ 2-Ohm 
200 Watts x 2 @ 4-Ohm Bridged
Total Power 
(Sum of Rated Power):
400 Watts RMS
Dynamic Power 
  79 Watts x 4 @ 4-Ohm 
138 Watts x 4 @ 2-Ohm 
255 Watts x 2 @ 4-Ohm Bridged
Bridgeable: Yes
Frequency Response: 20Hz to 20kHz +/-1dB
Efficiency (average): 80% @ 4-Ohm 
75% @ 2-Ohm
Crossover Controls: Front Channels: Variable 50Hz – 500Hz @ 12dB/octave 
Rear Channels: Variable 50Hz – 500Hz @ 12dB/octave
Tone Controls: 0dB to +18dB @ 45Hz
Signal Input: Low Level: 2 RCA Pair
Signal Output: Low Level: 1 RCA Pair
Power Input Connector: Block
Power Wire Gauge: 4 AWG
Speaker Output Connector: Block
Speaker Wire Gauge: 12 AWG
Heat Sink Type: Cast Aluminum
Cooling: Convection
Remote Controls: n/a
Visual Indicators: Power 
Circuit Topology Class: Full Range Class-D
Shipping Weight: 5.863 Lbs. 
(2.65 Kg.)
Dimensions (H x W x D): 1.97″ x 6.77″ x 9.10″ 
(5cm x 17.20cm x 23.10cm)
Dimensional Diagram:
0.0000 kg



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This product is now discontinued
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