M400-4D Prime Marine 400 Watt Full-Range Class-D


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Please note in order to achieve the full Rockford Fosgate experience our products are required to be installed by an Authorised Stockists. If you choose not to have the product installed by an RTTI trained dealer, you will also waiver the product warranty.

Product Information

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.
  • 2 Year Standard Warranty

Video & Review



CEA-2006 Compliant CEA-2006 Power Rating
75W x 4 @ 4Ω
≤1.0% THD+N
Number of Channels 4
Rated Power
(RMS Continuous Power):
75Watts 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
79Watts x 4 @ 4-Ohms
138Watts x 4 @ 2-Ohms
255Watts 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)

Product Manuals