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Rockford Fosgate Prime R750-1D

Mono subwoofer amplifier — 750 watts RMS x 1 at 1 ohm

15 Reviews | 4 questions - 12 answers


Our take on the Rockford Fosgate Prime R750-1D

Rockford Fosgate packs more power per square inch into their Prime Class D amps than almost any other amplifier made, so you can put more music power in your vehicle's limited space. Your bass will hit loud and clear with one of these reliable and cool-running amps. The versatile R750-1D puts out 250 watts RMS to a 4-ohm sub, but will crank out 750 watts RMS when it's running a 1-ohm subwoofer setup.

Rockford Fosgate packs more power per square inch into their Prime Class D amps than almost any other amplifier made, so you can put more music power in your vehicle's limited space. Your bass will hit loud and clear with one of these reliable and cool-running amps. The versatile R750-1D puts out 250 watts RMS to a 4-ohm sub, but will crank out 750 watts RMS when it's running a 1-ohm subwoofer setup.

Clean power, extensive controls
Rockford Fosgate designed this Prime amp to deliver Power Output Without Excessive Regulation (POWER), which means it'll respond quickly to the peak demands that you may throw at your system. Low-pass and subsonic filters, along with Rockford Fosgate's famous Punch bass boost, let you tune your subs for maximum performance, so your driver's seat will become your favorite place to pick up the beat. And, speaking of the driver's seat, you can hook up an optional wired remote knob to get fingertip control over this amp's bass impact.

Confused about impedance? Check out our article on matching subs and amps.

Product Highlights:

  • mono subwoofer amplifier
  • 250 watts RMS x 1 at 4 ohms (500 watts RMS x 1 at 2 ohms)
  • 750 watts RMS x 1 at 1 ohm
  • CEA-2006 compliant
  • variable low-pass filter (50-250 Hz, 12 dB/octave)
  • variable subsonic filter (15-40 Hz, 12 dB/octave)
  • variable Punch bass boost (0-18 dB at 45 Hz)
  • included wired remote Punch Level Control
  • Class-D amplifier design
  • MOSFET power and output stages
  • frequency response: 20-250 Hz
  • preamp-level inputs and outputs
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 60-amp in-line fuse between the distribution block and the amplifier is recommended
  • 9-1/8"W x 2"H x 7-3/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's in the Box:

  • Mono subwoofer amplifier
  • Punch Level Control module
  • 16.5' Punch Level Control cable terminated by an RJ25 connector on each end
  • 2 Small self-tapping screws (1/2" length)
  • 4 Large self-tapping screws (1-1/2" length)
  • 3mm Allen wrench
  • Installation & Operation Manual (Eng / Spa / Fre / Ger / Ita)
  • Amplifier Verification Certificate

More than enough power to get heat sound. Installed to power Kicker comp 10" sub. Wow what a power plant.

Matthew, Monroe, MI


Rockford Fosgate Prime R750-1D Reviews

Average Customer Review(s):

(15 Reviews)

Rockford Fosgate Prime R750-1D

Matthew from Monroe, MI on 12/4/2018

Crutchfield Customer Review (What's this?)

More than enough power to get heat sound. Installed to power Kicker comp 10" sub. Wow what a power plant.




Crutchfield customer from Glendale, AZ on 7/25/2018

Crutchfield Customer Review (What's this?)

hits hard and they give you a certificate stating the watts it was bench tested, mine was 861 watts!!!!

Pros: nothing but Pros!

Cons: nine

Worth the money

Adam from Headland, AL on 5/7/2018

Crutchfield Customer Review (What's this?)

Great small amp with big power

Pros: Small package with big power and good features

Cons: None

Killer little amp

Crutchfield customer from Montrose, IA on 3/11/2018

Crutchfield Customer Review (What's this?)

Fantastic amp! Proves the old saying is true, Dynamite comes in small packages. Certificate stated 833 watts rms & NEVER heats up. Absolutely love it! Best amp I've ever owned, buy one & you won't be disappointed.



More power than advertized

Mike from Kingston, PA on 2/4/2018

Crutchfield Customer Review (What's this?)

Has a ton of power for such a small amp. Perfect amount of power for my two P2 12''s. They advertise it as 750 watts, but the birth cirtificate says 870. As others have said, Rockford really under rates their products. Big thank you to Buzz for helping me out!

Pros: Compatible, powerful, everything on one side of the amp

Cons: Zero

Rockford Fosgate always

Crutchfield customer from Holden, LA on 12/13/2017

Crutchfield Customer Review (What's this?)

I haven't owned Rockford Fosgate since the late 90's. I have to say they haven't missed a beat. Still the same great quality in their products. If your looking for a great middle tier amp this is a great amp to get.



Rockford Fosgate Prime R750-1D

Crutchfield customer from Whidbey Island,WA on 4/2/2017

Crutchfield Customer Review (What's this?)

Got this amp to run 2 fosgate P3SD4 10" subs. More than enough power and the small dimensions made it easy to mount.

Pros: Cost, size, power


Rockford Fosgate Prime R750-1D

Anonymous from Mason City, IA on 9/19/2016

Crutchfield Customer Review (What's this?)

Nice little amp, that really isn't so little. QC tag showed over 800 watts RMS in 1 ohm. have it driving 2x Rockford Punch P1S2-12 12" 2 Ohm subs, and it sounds amazing. if the kid needs more power, we can get stronger subs and wire them into a 1 ohm load. Easy connectors and runs cool. Love this amp!!!

Pros: Ease of use, power, runs cool.

Cons: None

Rockford Fosgate Prime R750-1D

Mark from Honolulu, HI on 5/2/2016

Crutchfield Customer Review (What's this?)

Nice amp especially when on sale. In terms of specs, the alpine mrv-m500 it replaced might have been a bit better, but honestly it's not a noticeable difference. I'm running it at 2 ohms so the power output is the same. The reason I bought this amp was the option of 1 ohm stability and the variable subsonic filter. I went from a diy sealed box to a diy vented box tuned almost 20hz lower (26hz) so it was a must. Nice amount of power and the gain isn't past 3 after dialing it in.

Pros: Angled terminals for easy insertion of cables when mounted in an amp rack, included gain remote control, top mounted adjustment knobs

Cons: None so far other than the mounting screws I used are hard to secure when the amp is in a vertical position. I didn't use the screws that were included because they were too long, it's just hard to get them aligned with the pilot/screw holes because you can't see the bottom of the mounting holes on the amp.

Tons of power

ChrisL from Tulsa, Oklahoma on 12/31/2015

Crutchfield Customer Review (What's this?)

This amp delivers the certificate says 880 rms at 1 ohm! Hooked it up to a rockford fosgate p3d2 12 and it sounds amazing. Crutchfield had super fast shipping and awesome service!

Pros: Plenty of power, looks clean, small so easy install, runs cool

Cons: None

Rockford Fosgate Prime R750-1D

Noodle from Dallas, TX on 7/20/2015

Crutchfield Customer Review (What's this?)

Great little amp, I was impressed by the small footprint (This is my first D-class mono block amp). Only been using it for a few weeks now. Originally set the gain to roughly 10% and came back later to tune it. Set the gains to max clean output (roughly 30% turned). Using it with a Fosgate T0D212 @ 1ohm (700W RMS) in a ported box. Worlds better than my little 250W RMS amp/sub I had previously. Certificate in the box says my unit was rated at 870W. Its a great way to discover new rattles you never knew about, ha. I chose this one over the Power line 1000W after watching Steve Meade's Amp Test Tuesday youtube video; Half the price and still is a good bang-for-your-buck.

Pros: Great power, small footprint.

Cons: I wish it had the better inputs like the Power series; Im tired of these 45-degree angled-down connectors.

Surprisingly Awesome!!

Spud from Volcano, HI on 3/23/2015

Crutchfield Customer Review (What's this?)

I was very surprised. I was very leery with this purchase. I have never been a fan of Fosgate before due to overheating and lack of response and muddy sound. This was the only amp that i could find that had the required rms power i needed for my 2 - 12" phoenix gold r3. (400rms - 800pk ea) that was of any sort of quality. everything else was too big or too small. I figured that it would be good to stay under the 800 rms by 50 watts (due to a bad habit of mine of burning voice coils to flaming balls). when it showed up, i was even more leery of the size of it........ very small footprint.... i thought to myself..... 'oh great.... another fosgate going overheat and burn out on me with nothing but problems.....' I went ahead an hooked it up, and WOW...... instantly i was very excited (still leery of overheating). I decided to take a drive around the island, about 285 miles give r take, and ran it full capacity, full rms, full volume. at first, i started smelling voice coils..... ugh oh.... turned the gain down a bit feeling a little disappointed. when i got back it ran the entire time, just nice and warm, not smoking hot like my others, and stuck it on a friends dyno.... 889 RMS WATTS @ 1 ohm ! Buhya! all in all i am very please with this amp. it responds very well between extreme high/low frequencies quickly, very clean sound, and Way more power than i was expecting. Highly recommended to anyone looking for easy on pocket, but still good and reliable. thank you fosgate...

Pros: Cool running, high power, good response, small package, 1 ohm stable, a true beautiful product. better than punch series.....

Cons: its very nice to see an amp put out More watts than advertised for once..... but would be good to know it was capable to do so before getting tuned in. not all of us have a dyno, and if i wouldnt have been a hobbyist, i would have quickly burned up some brand new subs.... but still... Thank You! It's all about the base!

Just had installed in 08 Chevy 2500

Theo from okc, ok on 8/13/2013

Awesome amp recommended by my installer to power 2 12" kicker comp r @1 ohm and used with 3sixty fosgate line driver to put input voltage at 4 volt.Great setup.....

Pros: Small case , 1 ohm stable , bass nob included, cost


Rockford Fosgate Rocks

Josh P. from Hawkins, WI on 3/14/2013

Crutchfield Customer Review (What's this?)

Great power for a great price.

Pros: Easy installation.

Cons: Nothing that I can think of.


MK from Cincinnati, Ohio on 10/15/2012

Crutchfield Customer Review (What's this?)

Awesome amp, for the price and the name. Easily powers two 400 watt CompV subs. Controls on the amp allow for super easy sound adjustment. Bought it about two years ago and would buy again if I had to.

Pros: Small and compact but with huge power.



Hands-on research

Product Research



Overview: The Rockford Fosgate Prime R750-1D is a mono Class D amplifier. It is optimized to power subwoofers, and 1-ohm stable. The Class D design is very efficient with a cast aluminum heatsink to keep it in a small footprint. The amplifier has 85% average efficiency at 4-ohms or 2-ohms, and 80% at 1-ohm.

CEA 2006 Compliant: The R750-1D's power ratings are measured according to the strict standards dictated by the Consumer Electronics Association (CEA). These standards allow you to accurately compare the rated power output of all CEA 2006-compliant amplifiers, even different brands. Manufacturers who adhere to the standards can display the CEA 2006 logo on their products and packaging. The RMS power output is as follows (measured with a 14.4 volt input, <1% THD+N, 20 Hz-250 Hz):

  • 4-Ohm: 250 watts x 1
  • 2-Ohm: 500 watts x 1
  • 1-Ohm: 750 watts x 1

LED Indicator: The amplifier is equipped with a top-mounted LED indicator which illuminates blue when the unit is turned on. The LED illuminates red when a protection circuit engages (short circuit or too low an impedance is detected at the speaker connections). The amplifier automatically turns off if this occurs.

Mounting: The amplifier can be mounted vertically, horizontally, or inverted using the supplied mounting screws; horizontal mounting (right side up) will provide the best cooling.


Controls: The R750-1D has the following top-mounted controls:

  • Gain Control: a rotary gain control that can be adjusted from 1 to 11
  • Low Pass Filter: a 12 dB/octave Butterworth low pass filter with a crossover point variable from 50 Hz to 250 Hz
  • Infrasonic Filter: a variable 15-40Hz, 12 dB/octave infrasonic filter designed to prevent frequencies below the audio range from being applied to the subwoofer
  • Punch EQ: a rotary bass boost control, centered at 45 Hz, from 0 dB to +18 dB

Remote Punch Level Control: The amplifier includes a wired Remote Punch Level Control, which is linked to the gain control of the amplifier. The module allows you to remotely control the output level of the amplifier from the dash or center console of your vehicle. The Remote Punch Level Control features a rotary dial, and comes with mounting hardware and a 16.5' connector cable.


Terminals: The amplifier features heavy duty, nickel-plated set-screw terminals. The set screws can be tightened or loosened with the supplied 3mm Allen wrench. The terminals include:

  • Power/Ground: will accommodate up to 4-gauge wire
  • Remote Turn-On: will accommodate up to 8-gauge wire
  • Speaker Terminals: will accommodate up to 8-gauge wire. Two Positive (+) and Negative (-) terminals are provided for installation flexibility. Both terminals are wired in parallel internally.

Fuses: The amplifier does not have on-board fuses. A 60A fuse should be placed on the power wire within 18" of the battery.

RCA Input Jack: The RCA input jacks are nickel-plated to resist signal degradation caused by corrosion.

RCA Pass-Thru Jacks: The nickel-plated RCA pass-thru jack provides a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cables from the front of the 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?

1 ohm stable, perfect power for the subs I ordered. [ Dustin  Aug 08, 2018 ]
Expert recommended [ Ryan  Jan 16, 2018 ]
Recommended by Bryce [ Katie-Belle  Sep 04, 2017 ]
Talked to Adam he said it was good for the sub I just ordered from u [ CHESTER  Jul 05, 2017 ]
I choose this because of the variable subsonic filter and 1 ohm stability. [ Mark  May 26, 2016 ]
To add to factory installed amp [ Kervin  Dec 26, 2015 ]
To pair with the RF P2-2X12 speakers [ CHARLES  Dec 17, 2015 ]
The Fosgate amp was suggested by the Crutchfield technical support representative as a reasonable mid price range amp that supported the duel 12" subwoofer speaker selection. [ Howard  Dec 05, 2015 ]

4 questions already asked

It should be the top one the other is a pass threw to run to another amp [ Ron  Dec 11, 2018 ]
There is actually only one Stereo (Left and Right) Line Level Input. The other set of RCA's is a Loop-Through Output. This would be used, for example, if you were chaining together multiple amps. Hope this helps. [ David  Dec 11, 2018 ]
Use the "input" if it's going straight to your music source like your head unit and use the Throughput" if you are running the signal from this amp to another amp [ Kurtis  Dec 11, 2018 ]
rca [ Stephen  Dec 11, 2018 ]
I'm not familiar with the speaker. The amp is running two Kicker 4 ohm 10's (bridged mono) and it has PLENTY of power. [ Juan  Dec 05, 2018 ]
To be honest I honest with you I don't know I haven't hooked it up yet but my buddy that picked it out use to have a sponsor through crutchfild so he knows what he is doing when it comes down to it I'm looking it up to 2 two jl tens and forur jl door speakers in my 97 f150 and he said he would be able to get it to hit at one ohm so [ casey  Dec 03, 2018 ]
Yes I believe it would work just fine for a intermediate smooth bass system with a quality built box. If your looking to get loud a little more power wouldn't hurt. [ Ryan  Dec 03, 2018 ]
I believe you'll be happy with the performance of this amp. The one I have is 833 watts rms pushing a rockford fosgate p3 1x 12 at 1 ohm. The amp is only turned half way up and it HITS HARD! I would LOVE to hear it turned up higher with your two JL Audio subs!!! [ Torie  Dec 03, 2018 ]
I got a 10 inch Rockford P 3 and wired it at 1 ohm. A 12 inch P 3 would be awesome also. Will need 1000 watt max ratings to handle all the power. So crisp and clean power! Go for it you will be happy! [ Andrew  Nov 27, 2017 ]
You can get the pre-loaded box with the Rockford fosgate P3 x 1 and that should be more than enough. That's what i have on my 2006 Honda Accord. [ Alexis  Nov 27, 2017 ]
I am running a Rockford fosgate P3 10 in a ported box with this amp and it hits hard in my Mercury grand Marquis great amp well under rated check it out on you tube under amp test Tuesday it will push over 1200 watts RMS . [ Tracy  Nov 27, 2017 ]
Speaker Terminals: will accommodate up to 8-gauge wire. Two Positive (+) and Negative (-) terminals are provided for installation flexibility. Both terminals are wired in parallel internally. The right way to get to 2-ohms will depend on your subwoofer set-up. 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. [ Jeff  Feb 17, 2014 ]  Staff