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

Number of Channels

Bridgeable

Yes

Signal Input

Low Level: 2 RCA Pair

Power Input Connector

Block

Power Wire Gauge

4 AWG

Speaker Output Connector

Block

Speaker Wire Gauge

12 AWG

Cooling

Convection

Circuit Topology Class

Full-Range Class D

Frequency Response

20Hz 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 Controls

Front Channels: Variable 50Hz - 500Hz @ 12dB/octave
Rear Channels: Variable 50Hz - 500Hz @ 12dB/octave

Tone Controls

0dB to +18dB @ 45Hz

Signal Output

Low Level: 1 RCA Pair

Heat Sink Type

Cast Aluminum

Remote Controls

n/a

Visual Indicators

Power
Protect

Dimensions (H x W x D)

1.97" x 6.77" x 9.10"
(5cm x 17.20cm x 23.10cm)

Shipping Weight

5.863 Lbs.
(2.65 Kg.)

Efficiency (average)

80% @ 4-Ohm
75% @ 2-Ohm

CEA-2006 Compliant

CEA-2006 Power Rating
75W x 4 @ 4Ω
≤1.0% THD+N

Total Power
(Sum of Rated Power)

400 Watts RMS

ROCKFORD FOSGATE

ROCKFORD FOSGATE Prime Marine 400 Watt Class-D 4-Chanel Amplifier