P400X4

The Rockford Fosgate P400X4 is a powerful 4-channel amplifier from the popular Punch series that combines high-quality sound, flexible connectivity, and reliable performance. With up to 400 watts RMS of total power, this Class A/B amplifier is ideal for driving front and rear speakers or for a combination of a speaker system and a subwoofer.

Thanks to the built-in C.L.E.A.N. technology with clip indicators, the amplifier can be adjusted with exceptional precision to prevent signal distortion. The variable high- and low-pass filters, along with the built-in Punch EQ, allow for custom sound tuning. Balanced inputs reduce noise, while the automatic power-on function also makes it easier to connect to factory-installed car stereos.

The solid aluminum housing ensures efficient heat dissipation and highlights the high-quality craftsmanship of the Rockford Fosgate Punch Series.

Technical Specifications

General Characteristics

• Manufacturer: Rockford Fosgate

• Model: P400X4

• Series: Punch

• Amplifier Type: 4-Channel Power Amplifier

• Amplifier Class: Class A/B

• Total power: 400 watts RMS

• Bridgeable: Yes, 2-channel bridge mode is possible

• Operating voltage: 9–16 volts DC

• Frequency response: 20 Hz – 20,000 Hz (±1 dB)

• Efficiency: approx. 67% at 4 ohms

• Cooling: Passive, via aluminum heat sinks
  
  

RMS output power at 14.4 volts

• 4 × 50 watts RMS at 4 ohms

• 4 × 100 watts RMS at 2 ohms

• 2 × 200 watts RMS bridged at 4 ohms
  
  

Crossover Networks and Sound Settings

• High-pass filter (HPF): 50–250 Hz, continuously adjustable

• Low-pass filter (LPF): 50–250 Hz, continuously adjustable

• Filter slope: 12 dB/octave

• Filter characteristic: Butterworth

• Full-range operation: Yes

• Separate crossovers for front and rear channels

• Punch EQ2 Bass Boost: 0 to +18 dB at 45 Hz

• Punch EQ2 treble boost: 0 to +14 dB at 12.5 kHz

• Separate sound settings for front and rear channels
  
  

Signal Processing and Electrical Properties

• Input sensitivity: 150 mV – 12 V

• Input impedance: 20 kOhm

• Signal-to-noise ratio: over 85 dB (CTA/CEA-2006)

• Signal-to-noise ratio at rated power: over 105 dB

• Channel separation: over 50 dB

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

• Damping factor: over 500

• Total Harmonic Distortion plus Noise (THD+N): less than 1.0% at 4 ohms and 2 ohms

• Balanced signal inputs to reduce noise

• C.L.E.A.N. technology for optimal level adjustment

• Automatic activation via a high-level signal

• Built-in protection circuits against overload, short circuit, and overheating
  
  

Connections and Features

• Signal inputs: 2 pairs of RCA jacks (front/rear), also compatible with high-level signals

• Speaker outputs: 4 channels, bridgeable

• Power connection: C-clamp screw terminals

• Recommended power cable cross-sectional area: 4 AWG (approx. 21 mm²)

• Speaker cable terminals: 8–18 AWG

• Recommended external fuse rating: 60 A

• LED Indicators: Power, Protect, and Thermal

• Separate input and output clip meters

• Covered control panel on the top

• High-quality aluminum heat sink
  
  

Dimensions

• Width: 197 mm

• Height: 61 mm

• Length: 280 mm
  
  

What's Included

• 1 × Rockford Fosgate P400X4 4-Channel Amplifier

• 1 × User and Installation Manual

• 1 × Performance Certificate

• Mounting hardware