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Rockford Fosgate PM400X4 Punch Marine 400 Watt 4-Channel Amplifier

Brand: Rockford Fosgate
Model Number: PM400X4
UPC: 780687345099
Rockford Fosgate
Model Number: PM400X4
UPC: 780687345099

Rockford Fosgate PM400X4 Punch Marine 400 Watt 4-Channel Amplifier

  • Conformal-coated circuit board — suitable for powersports and marine applications
  • Marine-grade stainless steel hardware
  • Hidden top-mount control panel
  • Class AB amp technology
  • Frequency response: 20-20,000 Hz

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Product Description

Features & Specifications



Rockford Fosgate PM400X4 Punch Marine 400 Watt 4-Channel Amplifier

The Rockford Fosgate PM400X4 is a 400 Watt 4-channel amplifier with high dynamic power using Class-A/B technology and a conformal coated pc board designed for motorsport and marine applications. The PM400X4 is perfect for 4-way front-stage/rear-fill or 3-way front-stage/subwoofer systems. Simply drop a pair of component speakers on the front channels and subs on the rear and BOOM – you got “The PUNCH.” With its flexible design, the PM400X4 is an excellent amplifier choice for virtually any vehicle.

A powerful, versatile amp for your boat

Rockford Fosgate designed their PM400X4 4-channel amplifier for marine and powersports applications. It’ll power systems with front and rear speakers, it’ll drive a couple of subs in 2-channel mode, or you can switch the amp to 3-channel mode to power a set of speakers and a subwoofer.

Built tough for life on the water or off the road

Using a Class AB design, the PM400X4 delivers outstanding performance from a compact package. It’s built to stand up to outdoor life with conformal-coated circuitry that withstands moisture and dirt and stainless steel hardware that won’t succumb to corrosion. Rockford Fosgate also uses the innovative Maximum Efficiency Heat Sink Application (MEHSA3) construction process, which yields up to five times better heat transfer than traditional mounting techniques. As a result, this amp will rock out without overheating, even when tucked into a tight space.

Easy level settings

The PM400X4 uses Rockford Fosgate’s CLEAN level setting technology, so there’s no more guesswork while setting your gain levels. Easy-to-see LED indicators identify clipping so you can set your amp up for maximum performance while eliminating distortion.

Product Highlights:

  • High level input capable with Auto Turn-On circuit
  • Features C.L.E.A.N. Set-up
  • 12dB/octave Butterworth crossover
  • On-board Punch EQ with +18dB boost @ 45Hz
  • Muted turn on
  • Stealth top mounted control panel
  • Cast aluminum heatsink
  • Short circuit protection
  • Over current protection
  • Marine grade two part epoxy coating on circuit boards
  • Marine grade stainless steel hardware

Available Wiring Diagrams

Please consult your amplifier owner’s manual for lowest recommended impedance.

  1. Rockford Fosgate PM400X4
  2. Rockford Fosgate PM400X4
  3. Rockford Fosgate PM400X4
  4. Rockford Fosgate PM400X4
  5. Rockford Fosgate PM400X4
Brand Rockford Fosgate   Model Rockford Fosgate PM400X4
Product: Rockford Fosgate PM400X4 Punch Marine 400 Watt 4-Channel Amplifier

RMS Power Output (Watts x Channels): 50 x 4
Frequency Response at Rated RMS Power: 20-20k Hz
THD at Rated RMS Power: 1%
Input Voltage: 14.4v
Power at 2 Ohms (Watts x Channels): 100 x 4
Bridged Power (Watts x Channels): 200 x 2
Minimum Impedance Bridged: 4
Minimum Impedance Unbridged: 2
Amplifier Class: AB
Low-Pass Crossover Frequency: 50-250 Hz
Low-Pass Slope (dB/octave): 12 dB/octave
High-Pass Crossover Frequency: 50-250 Hz
High-Pass Slope (dB/octave): 12 dB/octave
Bass Boost: 0-18 dB
Bass Boost Frequency: 45 Hz
Fan Cooled: No
Fuse Rating: 60
Speaker Level Inputs: Yes
Preamp Outputs: No
Height (inches): 2-7/16
Width (inches): 11-1/16
Depth (inches): 8-13/16

What's in the box

Rockford Fosgate PM400X4 owner's manual
4-Channel marine amplifier
2.5mm Allen wrench
Four 1-1/2" Self-tapping screws
Setup guide
Certificate of Performance Verification

Mobile Amplifier Channels

4 Channel

Mobile Amplifier Class

Class AB

Mobile Amplifier Features

Bass Boost, High-Pass Filter, Low-Pass Filter, Speaker Level Inputs, Weather Resistant

Mobile Amplifier Fuse Rating


Mobile Amplifier RMS

351 to 750 watts

Mobile Min Impedance


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Rockford Fosgate Canada Limited 2-Year Warranty


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