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4 channel amplifier 50x4 @ 4O, 100x4 @ 2O, 200x2 @ 4O bridged

Cta-2006 Compliant

Number of Channels


Total Power
(Sum of Rated Power)

400 Watts

Rated Power
(RMS Continuous Power)

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

Dynamic Power

75 Watts x 4 @ 4-Ohm
130 Watts x 4 @ 2-Ohm
270 Watts x 2 @ 4-Ohm Bridged



Frequency Response

20Hz - 20kHz +/- 1dB

Input Sensitivity

150 mV to 12 V

Circuit Topology Class

Class D

Efficiency (average)

> 75%

Total Harmonic Distortion (THD+Noise)

4-Ohm < 1.0
2-Ohm < 1.0

Signal Input

Input Switch: 2ch/4ch input switch
Hi-Level: Variable DC offset sensitivity
High-Level: Harness
Low-Level: 2 Pair RCA

Signal Output

Tone Controls

Crossover Controls

High-Pass: 60Hz or 80Hz @ 12dB/Octave
Low-Pass: 80Hz @ 12dB/Octave

Remote Controls

Visual Indicators

Power: Blue
Protect: Red
Input Clip: Red
Output Clip: Blue/Violet/Red

LED Color Legend
BLUE: <0.5% TDH
RED: ≥10% THD

Power Wire Gauge


Power Input Connector

Detachable Compression Terminal

Speaker Wire Gauge

16 AWG

Speaker Output Connector

Front: 4-Pin Harness
Rear: 4-Pin Harness




Extruded Aluminum

Operating Voltage

9 - 16 VDC

Recommended Fuse
(not included)

60 A

Average Current Draw (13.8V Music)

27 A

Max. Current Draw (13.8V Sinewave)

50 A

Suggested Alternator

75 A

Included In The Box

Dimensions (H x W x D)

1.53 x 4.25 x 6.75 (in)
3.9 x 10.79 x 17.16 (cm)

Shipping Weight

3.1 Lbs. (1.4 Kg.)

The Rockford PBR400X4D is a full-range 4-channel amplifier designed for stereo front/rear systems that requires little space. The BRT (Boosted Rail Technology) is an ultra efficient design that generates 400 Watts of power! The BRT also has a variable hi-level DC offset turn-on circuit for easy installation into any OEM system. Great for motorcycles and recreational vehicles.



  • Full Range Class-D
  • Differential inputs with high level auto turn-on feature
  • C.L.E.A.N. input/output clip detection and indicator LEDs
  • 8 AWG power/ground connector
  • Remote-Out feature when using high level inputs
  • Extruded aluminum heatsink
  • Real time output and power supply thermal sensing
  • Selectable Fixed 12dB/Octave Butterworth Crossovers
  • Rockford Fosgate proprietary protection
  • Muted turn on
  • Discrete surface mount technology
  • Compact design for stealth installations
  • CEA-2006 and CE compliant

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