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Rockford Fosgate Punch Marine 100 Watt Full-Range Mono Amplifier (Pair) - PM100X1K

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Abt Model: PM100X1K UPC: 780687345204
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Rockford Fosgate Punch Marine 100 Watt Full-Range Mono Amplifier (Pair) - PM100X1K

The PM100X1 amplifier uses our patent pending BTL technology to provide you a very unique amplifier solution. This single channel amplifier utilizes the speaker output of the radio to not only provide the audio signal it needs, but also the power that runs the unit. This is done through a combination of the DC offset voltage commonly present and the audio AC signal itself.

Initially, it uses the DC offset voltage for its turn on power as well as primary amplification power. As volume is increased and the output power demand rises, the amplifier begins sharing the power load between the DC and AC signals. Once high volume is reached, the majority of the amplifier's power is provided from the AC signal only and is supplemented by its intenal storage bank. 

This design allows it to actually charge its capacitive bank on the downside of the AC signal wave which is essentially unused power anyway. It also presents no more load to the radio than a standard 2 or 4 ohm speaker would thus keeping the radio amplifier circuit safe from low impedance conditions. This design allows the amplifier to be connected to a radio with a rated 20 watt output and produce up to 100 watts dynamically. The unit also features a 2/ 4 ohm input switch to match the amplifier to the output impedance rating of the radio circuit. For speaker protection, we incorporate and selectable high pass crossover with setting at 60, 80 and 100Hz. 

In rare cases there is not enough DC voltage present to power the amp at turn on so an add on B+ wire is included and can be tied to other lower current circuits in its proximity. This design makes the amplifier ideal for OEM or aftermarket upgrades without having to use physically larger amplifiers as they can be hidden in the dash or doors of the vehicle. It is also IPX6 rated for those installs where moisture may be present.


  • Patented BTL Powered "FreeLoad" Technology (US 9,438,181 B1)
  • Harvests both B+ and Audio Signal From Standard Head Unit Speaker Outputs
  • Uses Stored Energy from BTL Amplifier to Produce Dynamic Power of Over 100W
  • Current Limited to Protect Head Unit for Both 4 Ohm and 2 Ohm Configurations
  • High Level Turn On
  • Optional B+ Connection for Non-Standard Speaker Outputs
  • Selectable 4 and 2 Ohm Play
  • 60, 80, and 100 Hz Selectable 12dB/Oct HP Butterworth Crossover
  • Small Stealth Package that Allows for Anywhere Installation
  • Pig Tail Connectivity for Easy Installation
  • Extruded Aluminum Heat Sink
  • Muted turn on
  • Thermal Protection
  • Short Circuit & Over Voltage Protection
  • Discrete surface mount technology
  • CEA-2006 Compliant & CE Compliant
  • Sold in pairs (left/right)
  • 2 Year Warranty


  • Element Ready™ - Amps
    These amplifiers are protected against Dust, UV, Corrosion, and feature Stainless hardware.
  • CEA-2006
    Power ratings on Rockford Fosgate amplifiers conform to CEA-2006 industry standards. These guidelines mean your amplifier's output power ratings are REAL POWER numbers, not inflated marketing ratings.
  • IPX6 Water Intrusion Rating
    IPX6 Water Intrusion Rating
  • ecoPUNCH
    A series of proprietary Rockford Fosgate technologies designed to deliver all the PUNCH, while consuming less juice.
  • FreeLoad
    Patented BTL powered "FreeLoad" technology is a small amplifier that does not require a B+/GND connection to produce power.


  • CEA-2006 Compliant
    • CEA-2006 Power Rating
      • 60W x 1 @ 4Ohm
      • <1.0% THD+N
  • Number of Channels: 1
  • Bridgeable: No
  • Frequency Response: 60Hz to 20kHz +/- 1.0dB
  • Total Harmonic Distortion (THD+Noise):
    • 4-Ohm: <1.0% 
    • 2-Ohm: <1.0%
  • Crossover Controls:
    • High-Pass: Selectable 60Hz, 80Hz, 100Hz @ 12dB/octave Butterworth 
  • Visual Indicators: Power/Protect LED
  • Cooling: Convection
  • Operating Voltage: 9 - 16 VDC

Approximate Dimensions:

  • Height: 1.3"
  • Width: 3"
  • Depth: 3.9"

Approximate Weight:

  • Shipping: 2.8 lbs

Warranty Information:

  • Manufacturer Warranty (authorized online retailer): 2 Year Parts & Labor
California customers:
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