PM400X2

The Rockford Fosgate PM400X2 is a high-performance 2-channel Class A/B amplifier from the Punch Marine series, designed specifically for demanding audio installations in the marine and powersports sectors. With up to 400 watts RMS in bridge mode, this amplifier delivers ample power for high-quality speaker systems or high-output subwoofers.

Thanks to its rugged marine-grade construction—featuring a specially coated circuit board, stainless steel components, and a solid aluminum heat sink—the PM400X2 is designed for use in demanding environmental conditions. The integrated C.L.E.A.N. technology facilitates precise adjustment of the amplifier and helps detect signal distortion early on.

The adjustable high- and low-pass filters, as well as the built-in Punch EQ, allow for custom sound tuning. In addition, the amplifier features high-level inputs with an automatic power-on function, RCA outputs for signal routing, and a connector for the optional PLC2 bass remote control.

Technical Specifications

General Characteristics

• Manufacturer: Rockford Fosgate

• Model: PM400X2

• Series: Punch Marine

• Amplifier Type: 2-channel amplifier

• Amplifier Class: Class A/B

• Applications: Marine, Powersports, and Car Audio

• Bridgeable: Yes

• Operating voltage: 9–16 V DC

• Frequency response: 20 Hz – 20,000 Hz

• Cooling: Passive aluminum heat sink

• Housing: Die-cast aluminum
  
  

RMS output power at 14.4 V

• 2 × 125 watts RMS @ 4 ohms

• 2 × 200 watts RMS @ 2 ohms

• 1 × 400 watts RMS @ 4 ohms (bridged)

• Minimum speaker impedance: 2 ohms per channel

• Minimum impedance in bridge mode: 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

• Full-range mode: Yes

• Filter characteristic: Butterworth

• Slope: 12 dB/octave

• Punch Bass EQ: 0 to +18 dB at 45 Hz

• Punch Treble EQ: 0 to +14 dB at 12.5 kHz

• Separate adjustment of the tone control depending on the filter setting
  
  

Audio and Signal Values

• Input sensitivity: 150 mV – 12 V

• Input impedance: 20 kOhm

• Signal-to-noise ratio according to CTA-2006: over 85 dB

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

• Channel separation: over 50 dB

• Common-mode rejection: over 55 dB

• Damping factor: over 500

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

Connections and Features

• RCA inputs: 1 pair

• RCA outputs: 1 pair for signal transmission

• High-level inputs: Yes

• Automatic power-on function via a high-level signal

• Remote connection: Yes

• Connector for optional PLC2 bass remote control

• C.L.E.A.N. technology for adjusting input and output levels

• LED indicators for clipping, operation, and protection status

• Power-On Delay with Mute

• Protected control panel integrated into the top surface
  
  

Protective Features and Marine Equipment

• Short-Circuit Protection

• Overcurrent Protection

• Thermal Protection Circuit

• Two-component epoxy coating for the printed circuit board

• Marine-grade stainless steel components

• Sturdy die-cast aluminum heat sink

• Protection against corrosive environmental conditions through marine-grade construction
  
  

Power Supply and Dimensions

• Recommended external battery fuse: 60 A

• Dimensions (W × H × L): 197 × 61 × 280 mm

• Color: Black
  
  

What's Included

• 1 × Rockford Fosgate PM400X2 2-channel amplifier

• 1 × User and Installation Manual

• 1 × Individual Performance Certificate

• Mounting hardware