R400-4D 400 Watt Full Range Class-D

R400-4D 400 Watt Full Range Class-D


In stock

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-Channel Amplifier

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.

  • 12dB/octave Butterworth crossover
  • RCA pass-thru outputs
  • 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 Standard Warranty

Video & Review



CEA-2006 Compliant CEA-2006 Power Rating
50W x 4 @ 4Ω
≤1.0% THD+N
Number of Channels 4
Rated Power
(RMS Continuous Power):
75Watts x 4 @ 4-Ohm
100Watts x 4 @ 2-Ohm
200 Watts x 4 @ 4-Ohm Bridged
Total Power
(Sum of Rated Power):
400 Watts RMS
Dynamic Power
80Watts x 4 @ 4-Ohms 0° Res
145 Watts x 4 @ 2-Ohms 0° Res
Bridgeable Yes
Frequency Response: 20Hz to 20kHz +/-1dB
Efficiency (average): 80% @ 4-Ohm

75% @ 4-Ohm

Total Harmonic Distortion (THD+Noise): 4-Ohm: <1.0%
2-Ohm: <1.0%
Crossover Controls: Front: Variable 50Hz – 500Hz @ 12dB/Octave
Rear: Variable 50Hz – 500Hz @ 12dB/Octave
Tone Controls: 0dB to +18dB @ 45Hz
Input Sensitivity: 150 mV to 4 V
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 Aluminium
Cooling: Convection
Remote Controls:
Visual Indicators: Power


Circuit Topology Class: Full Range Class-D
Operating Voltage: 9 – 16 VDC
Recommended Fuse
(not included):
50 A
Max. Current Draw (13.8V Sinewave): 50 A
Average Current Draw (13.8V Music): 25 A
Suggested Alternator: 75 A
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