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

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
Signal Input
Low Level: 2 RCA Pair
Power Input Connector
Power Wire Gauge
Speaker Output Connector
Speaker Wire Gauge
12 AWG
Circuit Topology Class
Full-Range Class D
Frequency Response
20Hz to 20kHz +/-1dB
Dynamic Power
  79 Watts x 4 @ 4-Ohm
138 Watts x 4 @ 2-Ohm
255 Watts x 2 @ 4-Ohm Bridged
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
Visual Indicators
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 GuidelinesCEA-2006 Power Rating
75W x 4 @ 4Ω
≤1.0% THD+N
Total Power
(Sum of Rated Power)
400 Watts RMS