ROCKFORD FOSGATE Prime 400 Watt 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.

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

A full-range version of the Class D topology which is a high efficiency amplifier design that ...

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Full-Range Class D

A full-range version of the Class D topology which is a high efficiency amplifier design that reduces current consumption from the charging system.

CEA-2006 Compliant

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

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CEA-2006 Compliant

Power ratings on Rockford Fosgate amplifiers conform to CEA-2006 industry standards. These guidelines mean your amplifier's output power ratings are REAL POWER numbers, not inflated marketing ratings.

P.O.W.E.R.

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

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P.O.W.E.R.

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

Class D

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

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CEA-2006 Compliant

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

Number of Channels

4

Total Power 
(Sum of Rated Power)

400 Watts RMS

Rated Power 
(RMS Continuous Power)

75 Watts x 4 @ 4-Ohm 
100 Watts x 4 @ 2-Ohm 
200 Watts x 2 @ 4-Ohm Bridged

Dynamic Power 
(PVC/PowerCube®)

80 Watts x 4 @ 4-Ohms 0° Res 
145 Watts x 4 @ 2-Ohms 0° Res

Bridgeable

Yes

Frequency Response

20Hz to 20kHz +/-1dB

Input Sensitivity

150 mV to 4 V

Circuit Topology Class

Full-Range Class D

Efficiency (average)

80% @ 4-Ohm 
75% @ 2-Ohm

Total Harmonic Distortion (THD+Noise)

4-Ohm: <1.0% 
2-Ohm: <1.0%

Signal Input

Low Level: 2 RCA Pair

Signal Output

Low Level: 1 RCA Pair

Tone Controls

0dB to +18dB @ 45Hz

Crossover Controls

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

Remote Controls

-

Visual Indicators

Power 
Protect

Power Wire Gauge

4 AWG

Power Input Connector

Block

Speaker Wire Gauge

12 AWG

Speaker Output Connector

Block

Cooling

Convection

Heatsink

Operating Voltage

9 - 16 VDC

Recommended Fuse 
(not included)

50 A

Average Current Draw (13.8V Music)

25 A

Max. Current Draw (13.8V Sinewave)

50 A

Suggested Alternator

75 A

Dimensional Diagram

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.)