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Prime 400 Watt Full-Range Class-D 4-Channel Amplifier R400-4D

Prime 400 Watt Full-Range Class-D 4-Channel Amplifier R400-4D

The PRIME R400-4D is an ultra-efficient 4-channel amplifier producing 100 Watts into four channels at 2-Ohms. Run a 4-way full-range system or use it with components on the front channels with subwoofers on the rear.

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The Prime R400-4D amplifier offers high efficiency through the implementation of its Class-D circuitry while being able to power a full-range system. This amplifier is optimized for 4-channel front/rear systems so you can run midrange/tweeters in the front doors/dash while running midrange/tweeters in the rear doors/deck. Match with a mono amplifier for subwoofers and you'll have a Rockford Fosgate system that any Car Audio Fanatic will envy.

  • RCA pass-thru outputs
  • 12dB/octave Butterworth crossover
  • Tri-stage protection covers thermal, over-current and short circuits.
  • On-board Punch EQ with +18dB boost @ 45Hz
  • 2/4 channel input switch
  • 4 Gauge power/ground connectors
  • Cast aluminum heatsink
  • Top mounted controls
  • 1 Year Warranty
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 Compliant

Power ratings on Rockford Fosgate amplifiers conform to CEA-2006 industry standards. These guidelines mean your amplifier's ...


Power supply and output design that allows the amplifier to increase power output as voltage increases.

Class D
Class D

High efficiency amplifier design that reduces current consumption from the charging system.

Recommended Fuse
(not included)
50 A
Operating Voltage
9 - 16 VDC
Suggested Alternator
75 A
Number of Channels
Total Power
(Sum of Rated Power)
400 Watts RMS
CEA-2006 Compliant
CEA-2006 Power Rating
75W x 4 @ 4Ω
≤1.0% THD+N
Tone Controls
0dB to +18dB @ 45Hz
Signal Input
Low Level: 2 RCA Pair
Power Input Connector
Power Wire Gauge
Speaker Output Connector
Heat Sink Type
Cast aluminum
Remote Controls
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.)
Dynamic Power
80 Watts x 4 @ 4-Ohms 0° Res
145 Watts x 4 @ 2-Ohms 0° Res
Efficiency (average)
80% @ 4-Ohm
75% @ 2-Ohm
Total Harmonic Distortion (THD+Noise)
4-Ohm: <1.0%
2-Ohm: <1.0%
Average Current Draw (13.8V Music)
25 A
Input Sensitivity
150 mV to 4 V
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: Variable 50Hz - 500Hz @ 12dB/Octave
Rear: Variable 50Hz - 500Hz @ 12dB/Octave
Signal Output
Low Level: 1 RCA Pair
Speaker Wire Gauge
12 AWG
Visual Indicators
Circuit Topology Class
Full-Range Class D
Frequency Response
20Hz to 20kHz +/-1dB
Max. Current Draw (13.8V Sinewave)
50 A
Dimensional Diagram
Signal-to-Noise (CEA)
85 dB
Common Mode Rejection
76 dB
Damping Factor
Channel Separation
74 dB

Return Authorization

Contact the Authorized Rockford Fosgate Dealer you purchased this product from. If you need further assistance, call 1-800-669-9899 for Rockford Customer Service. You must obtain an RA# (Return Authorization number) to return any product to Rockford Fosgate. You are responsible for shipment of product to Rockford.

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