Rockford Fosgate Prime R150X2

2-channel car amplifier — 50 watts RMS x 2

Item #: 575R150X2

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5 Reviews

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Rockford Fosgate power for your speakers

Rockford Fosgate performance in an affordable package — the Prime Series R150X2 2-channel amp can drive a pair of speakers with 50 watts RMS each, so you'll really feel your tunes rockin'. Or, you could switch the R150X2 to 1-channel mode to run a sub with 150 watts RMS — when you buy a bigger amp for your subs later on, you can still use this 2-channel to drive your front speakers. Smart move.

You can use the high- and low-pass filters and Rockford Fosgate's famous Punch boost to get maximum performance from the speakers in your vehicle. And speaker-level inputs let you hook this amp up to almost any system, even a factory stereo.

Rugged performance and value

The R150X2's heavy cast-aluminum chassis efficiently draws damaging heat away from its internal components, ensuring reliable, long-term play. The amp's built-in sensors keep track of the output current and power supply temperature, ensuring that plunging speaker impedances (they change constantly during play) or even a short circuit won't hurt anything. Your driver's seat will become your favorite place for listening to music once this Prime amp goes to work.

Product Highlights:

  • 2-channel car amplifier
  • 50 watts RMS x 2 at 4 ohms (75 watts RMS x 2 at 2 ohms)
  • 150 watts RMS x 1 bridged output at 4 ohms (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • variable high- and low-pass filters (50-250 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 45 Hz)
  • Class-AB amplifier design
  • MOSFET power supply
  • frequency response: 20-20,000 Hz
  • preamp and speaker-level inputs
  • preamp outputs
  • 8-gauge power and ground leads and a 20-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 20-amp in-line fuse between the distribution block and this amplifier is recommended
  • 11-1/4"W x 2"H x 7-3/8"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 R150X2 Reviews

Average Customer Review:

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RF Prime 150

Written By Howard, West Virginia on Saturday, November 14, 2015

Crutchfield Customer Review (What's this?)

Excellent add-on amp. Powers a set of rear speakers in a van. Great power - and mounted easily under driver's seat.

Pros: Clear, clean sound in a compact size

prime r150x2

Written By ScottW, charlottesville va on Monday, August 17, 2015

Crutchfield Customer Review (What's this?)

Always been a huge fan of RF and this product does not disappoint. It produces great sound at an affordable price. I would recommend this to anyone looking to upgrade their car stereo

Pros: Looks great. Easy to install. Clean bass and sound quality is tremendous.

Cons: none


Written By EdrickJ., Florida,PR on Friday, September 12, 2014

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I bought this amp to use it with a pair of Rockford Fosgate P1675-S in 4 ohm load to my son's 97 hyundai accent sound amazing!! if your looking something with not breaking the bank..this is the amp FOR YOU!!

Pros: easy to install!!

Cons: would like to see changes in the future with the cover of the amp!!

Delivers as promised

Written By Jon, Florida on Wednesday, January 15, 2014

Crutchfield Customer Review (What's this?)

I paired this amp with a single JL Audio 8W1v2-4 subwoofer, in my 2001 Tahoe, and I am extremely happy. On the Low Pass setting all I hear is bass. Plenty of power at a great cost. And when I'm ready to upgrade, I can use this for my door speakers on the high pass setting if need be. Hardest part of install was getting power cable from the engine compartment to the cab of my truck.

Pros: Installation couldn't have been easier.

Great amp

Written By Agres, Tucson, AZ on Thursday, April 25, 2013

Crutchfield Customer Review (What's this?)

Great amp. I needed a little more power to my door speakers to hear them over my exhaust and this amp did the job!

Pros: Clean sound, easy set up and wiring. Slim and easy to stash out of sight.

Cons: None so far

Hands-on research

What's in the box?

Download owner's manual

  • 2-Channel amplifier
  • 6" Speaker level input harness
  • 3mm Allen wrench
  • Four 3/4" Self-tapping screws
  • 4 Flat washers
  • Installation & Operation manual (English/ French/ Spanish/ German/ Italian)
  • Amplifier verification certificate

Product Research



Overview: The Rockford Fosgate Prime R150X2 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 speaker.

CEA 2006 Compliant: The R150X2's power ratings and signal to noise ratio are measured according to the uniform standards advocated by the Consumer Electronics Association (CEA). This allows you to accurately compare these specifications for all CEA 2006-compliant amplifiers, even from different brands. Manufacturers who adhere to these standards can display the CEA 2006 logo on their products and packaging. CEA2006 Specifications for this amplifier are:

  • 4 Ohms: 50 watts RMS x 2 at 4 ohms, 14.4 volts, and less than 1% THD+N
  • 2 Ohms: 75 watts RMS x 2 at 2 ohms, 14.4 volts, and less than 1% THD+N
  • Bridged: 150 watts RMS x 1 at 4 ohms, 14.4 volts, and less than 1% THD+N
  • S/N: 80 dB, measured at 1 watt output (100 dB measured at rated power)

LED Indicator: The amplifier is equipped with an LED power/protect indicator. The LED illuminates blue when the unit is turned on. It illuminates red if the thermal or short circuit protection circuit is engaged, and the amplifier will automatically turn off.

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: Use the amplifier's gain control to match the output of the source unit. The rotary gain control is labeled 1 to 11 and has a sensitivity range of 150mV to 4V when using the RCA inputs, 450mV to 12V when using the speaker level inputs.

Crossover: The amplifier is equipped with a 12dB/octave Butterworth crossover. A crossover switch allows you to choose low-pass, high-pass, or full-range operation. The crossover point is continuously variable from 50 to 250 Hz.

Punch EQ: The Punch EQ bass boost circuit is adjustable from 0 (min) to +12dB (max) and centered at 45Hz.


Power Terminals: The power and ground terminals are nickel-plated set screw terminals and will accommodate up to 4 gauge power and ground wires.

Fuse: An external 20-amp fuse (not included) must be installed on the power wire at the battery. If a wiring kit is used which includes a fuse with a value other than 20-amps, the original should be replaced with a 20-amp fuse.

Remote Turn-On Terminal: The remote turn-on terminal is a nickel-plated set screw terminal that will accommodate up to an 8 AWG wire. It's used to remotely turn the amplifier on and off.

Speaker Terminals: The two pair of speaker outputs are nickel-plated set screw terminals what will accommodate up to 8 AWG speaker wire.

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

Speaker Level Input: A speaker level input harness is included, making it easier to add the amplifier to a factory radio or to a receiver with no preamp outputs.

RCA Output Jacks: A pair of RCA pass-thru jacks provides a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cables from the front of your vehicle to the amplifier location.

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.