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Our take on the Rockford Fosgate Prime R150X2

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.

Very good amp.Very happy with purchase.

Chuck, Brownsville, TN

What's in the Box:

  • 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 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

Rockford Fosgate Prime R150X2

Average Customer Review(s):

(7 Reviews)

Rockford Fosgate Prime R150X2

Chuck from Brownsville, TN on 10/3/2016

Crutchfield Customer Review (What's this?)

Very good amp.Very happy with purchase.

Pros: Very good sound.easy installation.

Cons: None

Great little amp

trackchamp18 from canal winchester, OH on 3/20/2016

Crutchfield Customer Review (What's this?)

amp doesn't get very hot, powers my door speakers perfectly.

Pros: small size, doesn't' get real hot

Cons: none so far.

RF Prime 150

Howard from West Virginia on 11/14/2015

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

ScottW from charlottesville va on 8/17/2015

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


EdrickJ. from Florida,PR on 9/12/2014

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

Jon from Florida on 1/15/2014

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

Agres from Tucson, AZ on 4/25/2013

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

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.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

quality and recommendation [ Glenvall  Oct 02, 2016 ]
Rex's advice. [ William  Sep 28, 2016 ]
Cost [ ALEJANDRO  Aug 15, 2016 ]
I chose this amp because of the reviews on Crutchfield. I wanted a dependable long lasting amp. [ Hugh  Jul 20, 2016 ]
Wanted to upgrade the power output to new receiver installation. [ William  Mar 09, 2016 ]
Chance - put everything in my cart that will work with my vehicle. Chance's Bio: [ Ed  Jan 18, 2016 ]
We like Rockford. Used it before and had Goodluck with it. [ GENE  Dec 23, 2015 ]
This is a great amp at a great price. I paired this with an Alpine head unit (UTE-52BT) and kicker 6x9's (40CS6934) for a 2 channel set up. I chose this over the Alpine amps since this had the pre-amp inputs from the head unit. Overall, everything was purchased on a discount and should all work together with no issues. This was a great Crutchfield team recommendation for my head unit and speakers since I wanted to use the pre amp outputs of a head unit. [ Brandon  Dec 23, 2015 ]
Brand Name and History with Product [ richard  Dec 16, 2015 ]

6 questions already asked

According to Rockford stats, that amp will put out 75 watts per side @ 2 ohms. You would have to wire each side/channel using two 4 ohm door speakers on each side, in parallel, or bi-wire each speaker on each channel to the amp. It should work, but I don't know how loud you play your music. Theoretically that configuration will nearly double a transistor amp output before clipping, as most mid-fi car audio head units are rated @ < 1% THD. Try it. [ RICHARD F  Aug 31, 2016 ]
Yes it can [ KEVIN  Aug 30, 2016 ]
The simple answer is yes. It is only a 2 channel amp, so you would wire 2 speakers on left channel and 2 on the right and you would lose front to rear fading capabilities. [ LYLE  Aug 29, 2016 ]
NO! It's 2 channel 4 ohm ... You want a 4 channel 4 ohm! [ Frank  Aug 29, 2016 ]
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility/connection with your factory system. They will be able to pull up your vehicle and see how everything integrates, and what you will need for installation. [ Kenny  Aug 06, 2016 ]  Staff
This power amp is rated for 2-channel stereo at ONLY 50 watts per side at 1.0 % Total Harmonic Distortion. I would NOT recommend it to power two 125 watt rated 12" subwoofers, it would be too under powered and over distorted. Yes one could get sound out of the subwoofer but it would be unpleasant and likely distorted. When one uses subwoofers, one should match the power amp to the speaker rating AND it would even be better to have the amp slightly more powerful so as to avoid distortion. I would suggest at least a power amp of 150 watts per side @ no more than 1.0 % Total Harmonic Distortion. DON'T BUY a lesser amp, and yes you'll have to spend more money, but at least when you turn it up, ( and that's probably why you want "two" 12" subs ), it'll sound the way I suspect you'll want it to. I used this amp to upgrade the head unit to the door speakers only. [ RICHARD F  Mar 25, 2016 ]
A lot will depend on how many ohms you're using. At 4 0hms, the amp will put out 50 watts RMS per channel maximum. At 2 ohms, 75 per. This info is readily accessible at Again, these are ratings with the power turned all the way up. Since, hopefully you realize that you should never do such a thing, I would safely say that you should have absolutely no problems powering speakers rated at 70 watts. I'm powering 2 Polk Audio DXi571 speakers with great results. [ William  Dec 13, 2014 ]
The amp spec sheets often do show a higher power rating. This is usually between 10-30% over rated power and will be specific to that amplifier. I think this will be a great match for your speakers. If it were to be higher rated than the speakers, then you can simply set the gain down slightly to compensate. [ Jeff  Dec 11, 2014 ]  Staff
Thanks for your question. For information on selecting the best amp for your subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Krissy  Mar 24, 2014 ]  Staff
You will want to contact an Advisor by phone or online chat to discuss compatibility with your vehicle. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you. [ Jeff  Jan 06, 2014 ]  Staff