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Power for your music that'll fit almost anywhere

The Prime Series R125-2 2-channel amp gives you Rockford Fosgate performance in an incredibly small package, driving each of your speakers with 40 watts RMS to fill your car with great music. You can also bridge this workhorse amp into 1-channel mode to deliver 125 watts RMS to a sub. The built-in frequency filters and Rockford Fosgate's famous Punch bass boost allow you to adjust the amp to work best with your speaker setup and your vehicle.

R125-2 control panel

Performance and value

Rockford Fosgate designed Prime amps to deliver Power Output Without Excessive Regulation (POWER), which means they'll respond quickly to the peak demands that you may throw at your system. The included wired remote lets you control the amp's volume level from the front seat. Your driver's seat will become your favorite place for listening once this compact Prime amp goes to work.

Prime Series R125-2 2-channel amp

Product Highlights:

  • 2-channel car amplifier
  • 40 watts RMS x 2 at 4 ohms (65 watts RMS x 2 at 2 ohms)
  • 125 watts RMS x 1 bridged output at 4 ohms (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • high-pass filter (80 Hz, 12 dB/octave)
  • variable low-pass filter (50-250 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 45 Hz)
  • wired remote control included
  • Class-AB amplifier design
  • MOSFET power and output stages
  • frequency response: 20-20K Hz
  • preamp inputs and outputs
  • 10-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • fuse rating: 25A x 1
  • 7-3/4"W x 2-7/16"H x 7-11/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Rockford Fosgate Prime R125-2 Reviews

Average Customer Review:

2 Reviews

Great for a truck

Written by: Mack from Petersburg, VA on January 2, 2013

Crutchfield Customer Review (What's this?)

Recieved the amp in record breaking time from Crutchfield to replace an amp that had out lived it's life's expectency. The amp is small but powerful. Perfect for mounting behind the seat my truck. The install was very straight forward. I have the amp pushing a 10 inch MTX in a ported box. It gives me all the bass I need and it doesn't get hot. I recommend this product to anyone who is looking for quality sound.

Pros: Small in size but big in bass.

Cons: None

not a "thumper" but much better than expected

Written by: Mike from Gallatin, TN on May 1, 2012

Crutchfield Customer Review (What's this?)

Operation and setup was very easy to understand for a novice like me. Adds just the right amount of power to make the receiver perform well

Pros: size (I have a regular cab truck), price, ease of use, sound

Cons: none at all

Hands-on research

What's in the box?

Download owner's manual

  • 2-Channel amplifier with 25A ATC fuse installed
  • Spare 25A ATC fuse
  • Four 4mm x 20mm self-tapping screws
  • 4 Flat washers
  • Installation & Operation manual

Product Research



Overview: The Rockford Fosgate Prime R125-2 2-channel amplifier is designed to power a set of full-range or component speakers. The amplifier can also be bridged to power a single subwoofer.

CEA 2006 Compliant: The Rockford Fosgate Prime R125-2's power ratings are measured according to standards provided by the Consumer Electronics Association (CEA). These standards allow you to accurately compare the rated power output of all CEA 2006-compliant amplifiers, even if they come from different brands. Manufacturers who adhere to the standards can display the CEA 2006 logo on their products and packaging. CEA2006 Specifications for this amplifier are:

  • Two-Channel: 40 watts RMS x 2 at 4 ohms, 14.4 V, and 1% THD+N (65 watts x 2 at 2 ohms, 14.4 V, and 1% THD+N)
  • Bridged: 125 Watts x 1 at 4 ohms, 14.4 V, and 1% THD+N

LED Indicators: The Rockford Fosgate amplifier is equipped with two side-mounted LED indicators.

  • Power LED: illuminates blue when the unit is turned on.
  • Protect LED: illuminates red if a short circuit or too low of an impedance is detected at the speaker connections. The amplifier will automatically shut down if this occurs.

Mounting: The amplifier can be mounted vertically or horizontally using the supplied mounting screws. The amplifier should never be mounted in an engine compartment as this will void the warranty.


Gain Control: The amplifier's gain control is preset to match the output of most source units. The gain control can be adjusted from 1 to 11 with an input sensitivity range of150mV to 8V.

Crossovers: The amplifier is equipped with 12dB/octave Butterworth crossovers. The Crossover Switch allows you to select from the following:

  • All-Pass (full-range): The all-pass setting allows all frequencies (20-20kHz) to pass through the amplifier from your connected headunit to your speakers.
  • High-Pass: The high-pass setting is fixed and allows only frequencies above 80Hz to pass through the amplifier to your speakers.
  • Low-Pass: The low-pass setting is variable and allows only frequencies below 50-250Hz to pass through the amplifier to your speakers.

Punch Bass: The Punch bass control is adjustable from 0 (min) to +12dB (max) at 45Hz (fixed).


Power Terminals: The power and ground terminals are nickel-plated screw terminals and will accommodate up to 4 AWG power/ground wire (up to 1/2" spade or ring-style connector).

Note: Based on the 25A fuse rating and the power output of the amplifier, a 10-gauge amplifier wiring kit is recommended.

Remote Turn-On Terminal: The remote turn-on terminal is a nickel-plated screw terminal that will accommodate up to an 8 AWG wire (up 3/8" spade or ring-style connector). This terminal is used to remotely turn-on and turn-off the amplifier when +12V DC is applied, when connected to your head unit's remote turn-on lead.

Speaker Terminals: The four speaker terminals (left +/- and right +/-) are heavy duty, nickel-plated screw-terminals what will accommodate up to 8 AWG speaker wire (up to 3/8" spade or ring-style connectors).

RCA Input Jacks: The industry standard RCA jacks provide an easy connection for signal level input. They are nickel-plated to resist signal degradation caused by corrosion.

RCA Output Jacks: This pair of RCA pass-thru jacks provide a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cable from the front of your vehicle to the rear amplifier location. They are nickel-plated to resist signal degradation caused by corrosion.

Fuse: The amplifier is equipped with one installed 25-amp ATC fuse. The amplifier also comes supplied with a spare 25-amp fuse.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.