PBR400X4D

The Rockford Fosgate Punch PBR400X4D is an exceptionally compact Class D 4-channel amplifier that delivers a total output of up to 400 watts RMS despite its small size. Thanks to its high efficiency, low heat generation, and space-saving design, it is ideal for vehicles with limited installation space, motorcycles, ATVs, and discreet car audio installations.

Modern amplifier technology ensures powerful, low-distortion music playback. With high-level inputs, an automatic power-on function via DC offset detection, and a switchable 2-/4-channel input, the PBR400X4D can be integrated into both factory-installed systems and custom-built sound systems.

Built-in high-pass and low-pass filters allow for precise tuning to match the connected speakers. The bridgeable output channels offer additional flexibility for various speaker and subwoofer configurations.

Technical Specifications

General Characteristics

• Model: Rockford Fosgate Punch PBR400X4D

• Amplifier Type: 4-channel amplifier

• Amplifier Class: Class D

• Maximum total RMS power: 400 watts

• Output stage: MOSFET

• Channel Operation: 4-channel, 3-channel, or 2-channel bridged

• Input Configuration: Switchable between 2 and 4 channels

• Cooling: Passive, via aluminum heat sinks

• Design: Ultra-compact housing
  
  

RMS output power at 14.4 volts

• 4 ohms: 4 × 50 watts RMS

• 2 ohms: 4 × 100 watts RMS

• 4 ohms bridged: 2 × 200 watts RMS
  
  

Crossover Networks and Audio Characteristics

• Frequency range: 20 Hz – 20,000 Hz

• Frequency response: ±1 dB

• High-pass filter (HPF): 60 Hz or 80 Hz

• Low-pass filter (LPF): 80 Hz

• Full-range operation: Yes, via All-Pass setting

• Slope: 12 dB/octave

• Filter characteristic: Butterworth

• Input sensitivity: 150 mV – 12 V

• Input impedance: 20 kOhm

• Total Harmonic Distortion plus Noise (THD+N) at 4 ohms: less than 1.0%

• Total Harmonic Distortion plus Noise (THD+N) at 2 ohms: less than 1.0%

• Signal-to-noise ratio according to CTA-2006: over 80 dB

• Signal-to-noise ratio at rated power: over 100 dB

• Channel separation: over 50 dB

• Common-Mode Rejection Ratio (CMRR): over 55 dB

• Punch EQ: Not available
  
  

Connections and Features

• RCA (low-level) inputs

• High-level inputs for factory-installed radios

• Automatic Power-On via DC Offset Detection

• Adjustable DC-Offset Turn-On Threshold

• 2-/4-Channel Input Selector Switch

• Removable speaker connections via 4-pin Molex connectors

• Speaker connection wires: 16 AWG

• Detachable power connector for positive, ground, and remote

• LED Operating and Status Indicators

• LED indicators for detecting input and output clipping

• Protective circuits against short circuits and overheating
  
  

Electrical Properties

• Operating voltage: 9–16 volts DC

• Recommended external fuse: 60 A

• Minimum speaker impedance in stereo mode: 2 ohms

• Minimum speaker impedance in bridge mode: 4 ohms

• Recommended wire gauge: 8 AWG (approx. 8.4 mm²)
  
  

Dimensions

• Length: 172 mm

• Width: 108 mm

• Height: 39 mm
  
  

What's Included

• 1 × Rockford Fosgate Punch PBR400X4D 4-Channel Amplifier

• RCA/Molex Input Adapter

• Molex Speaker Connection Cables

• Detachable power connector for positive, ground, and remote

• Installation and Operating Instructions

• Installation CD with test tones and instructions