Rockford Fosgate Prime R750-1D

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

Outlet: Scratch & Dent

Item #: 575R7501D

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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 400 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.

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

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 R750-1D Reviews

Average Customer Review:

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Rockford Fosgate Prime R750-1D

Written By Noodle, Dallas, TX on Monday, July 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!!

Written By Spud, Volcano, HI on Monday, March 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

Written By Theo, okc, ok on Tuesday, August 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

Written By Josh P., Hawkins, WI on Thursday, March 14, 2013

Crutchfield Customer Review (What's this?)

Great power for a great price.

Pros: Easy installation.

Cons: Nothing that I can think of.


Written By MK, Cincinnati, Ohio on Monday, October 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

What's in the box?

Download owner's manual

  • 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

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

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.