Punch 400 Watt Full-Range 4-Channel Amplifier

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

-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.)
Shipping Information

Our on-line store is open 24/7 and we ship Monday through Friday, excluding some holidays. Orders received for products without shipping restrictions on its product page will ship the same business day when received before 12:00 p.m. PST. Orders in high demand will have an estimated production time listed on its product page and will ship according to the date listed.

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How your signal is delivered Matters !

Audiophile quality signal built with the highest quality materials at the best price! Zero to no resistance means les heat and a better signal.

What Is High Level or Low level?

High level : AKA Speaker level is an amp that can handle an input voltage of 8-40v. This high output is common in factory amplified vehicles or where the
max voltage of a head unit is more then 10v. This is normally identified by a pigtail connection point or via the RCA on the amplifier (must check user manual to verify.) Some amps have a switch for this. NOT all amps have this future.

Low Level : is 0-8v of signal voltage. This is most commonly found inaftermarket head units. or other aftermarket units that use can-bus. Most passive LOC units output 0-5v so they are considered a low level and are normally RCA to RCA. Modern day ACTIVE LOC units can output 0-10v of signal.

In conclusion an LOC works as an in line filter that lest you control the signal, its intercity and in some cases the playable frequency range.

If your amp takes a high level and it is within the vehicles factory output range then you dont need an loc unit and can wire in and out of your amp
directly. In some fords the signal can be flattened at the OB2 furthering the simplification of the installation.

see what else we have ..