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

$549.00 $439.00

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

Specifications - 

Number of Channels4
Signal InputLow Level: 2 RCA Pair
Power Input ConnectorBlock
Power Wire Gauge4 AWG
Speaker Output ConnectorBlock
Speaker Wire Gauge12 AWG
Circuit Topology ClassFull-Range Class D
Frequency Response20Hz to 20kHz +/-1dB
Dynamic Power
(PVC/PowerCube®) 79 Watts x 4 @ 4-Ohm
138 Watts x 4 @ 2-Ohm
255 Watts x 2 @ 4-Ohm Bridged
Dimensional Diagram
Rated Power
(RMS Continuous Power) 75 Watts x 4 @ 4-Ohm
100 Watts x 4 @ 2-Ohm
200 Watts x 2 @ 4-Ohm Bridged
Crossover ControlsFront Channels: Variable 50Hz - 500Hz @ 12dB/octave
Rear Channels: Variable 50Hz - 500Hz @ 12dB/octave
Tone Controls0dB to +18dB @ 45Hz
Signal OutputLow Level: 1 RCA Pair
Heat Sink TypeCast Aluminum
Remote Controlsn/a
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
CEA-2006 CompliantCEA-2006 GuidelinesCEA-2006 Power Rating
75W x 4 @ 4Ω
≤1.0% THD+N
Total Power
(Sum of Rated Power)400 Watts RMS