Rockford Fosgate R500X1D

Prime Series mono subwoofer amplifier — 500 watts RMS x 1 at 2 ohms

Item #: 575R500X1D

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13 Reviews



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Rockford Fosgate power for your sub

Rockford Fosgate performance in a small package – this Prime Series R500X1D mono amp can drive a sub with up to 500 watts RMS, so you can really feel your bass rockin'. You can use the low-pass filter and Rockford Fosgate's famous Punch boost to get the best possible bass from the sub and enclosure in your vehicle. A phase switch gets your subs firing along with your other speakers for maximum impact, while the speaker-level inputs let you hook this amp up to almost any system, even a factory stereo.

Rugged performance and value

The R500X1D'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 subwoofer impedances (they change constantly during play) or even a short circuit won't hurt anything. 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 Prime amp goes to work.

Putting together a bass system with this amp? Check out these Crutchfield-approved single 10" loaded enclosed, single 12" enclosed, and dual loaded enclosed bass packages.

Product Highlights:

  • mono subwoofer amplifier
  • 300 watts RMS x 1 at 4 ohms (500 watts RMS x 1 at 2 ohms)
  • CEA-2006 compliant
  • variable low-pass filter (50-250 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 45 Hz)
  • phase switch
  • wired remote Punch Level Control included
  • Class-D amplifier design
  • frequency response: 20-250 Hz
  • MOSFET power supply
  • preamp and speaker-level inputs
  • preamp outputs
  • 8-gauge power and ground leads and a 50-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 50-amp in-line fuse between the distribution block and this amplifier is recommended
  • 8-1/2"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 R500X1D Reviews

Average Customer Review:

13 reviews
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Written By BT, Raleigh, NC on Tuesday, July 07, 2015

Crutchfield Customer Review (What's this?)

Happy so far. Bought this to replace a MTX amp. Drives 2 12" @2 ohm. Hits hard. Especially compared to the MTX I replaced. And it does not overheat like the MTX.

Pros: Performance for the money Doesn't overheat and shut off when pushing it.


Written By Maynard, New York on Sunday, May 03, 2015

Crutchfield Customer Review (What's this?)

Its really good

Great amp

Written By Kw, Texas on Tuesday, April 21, 2015

Crutchfield Customer Review (What's this?)

Best bump for your buck

Pros: Pushing 2 12s in a sealed box for a dodge truck under the seats and it goes hard

Cons: None

Rockford Fosgate R500X1D

Written By jamesb, Oregon. on Thursday, January 22, 2015

Crutchfield Customer Review (What's this?)

This little guy is strong. The nice thing about rockford is they test the true RMS before sending it out and mine was rated for 640 rms.

Pros: Compact Strong

Cons: In the manual from Crutchfield It says to use 8 Guage wire with a 50amp. I did that and fried the fuse immediately. Switched to 6 Guage wire and a 80 amp fuse. Works great.

Crutchfield response on Tuesday, January 27, 2015 The Rockford's owner's manual for this amp does indeed specify 8-gauge wiring and a 50-amp fuse (which is why we also recommend that). But that's for a 500-watt RMS amp. If you're getting upwards of 640 watts, then it's no surprise that the 50-amp fuse wasn't up to the job, especially if you're really pushing the amp. And switching up to the 6-gauge wire is a smart move. That'll make it easier for the amp to get the juice it needs. Good luck and enjoy that amplifier!

Great Amp

Written By Anonymous, Charleston,SC on Sunday, November 02, 2014

Crutchfield Customer Review (What's this?)

This amp is great. It powers my 1 12"sub with no problems. The sound is very clean,I would recommend this to anyone!

Pros: -Clean sound -Small -Easy to set up and enjoy

Cons: NONE

Love the amp

Written By Anonymous, Baton Rouge on Monday, October 20, 2014

Crutchfield Customer Review (What's this?)

great amp... nice price,,, pushing 2 12s pioneer

Pros: small.... great clean power....


Written By Anonymous, Suffolk, VA on Wednesday, July 30, 2014

Crutchfield Customer Review (What's this?)

Love the way this amp performs and keeps the sub's slamming! Expect upwards if 600 RMS with this, mine came in rated at 652 RMS. Definatley worth the buy.

Pros: Small, Compact, Sound Quality.

Bang for the Buck

Written By CCH, KY on Monday, July 28, 2014

Crutchfield Customer Review (What's this?)

Using this amp to power two R2D2-12" subs wired at a 2ohm load,and it rocks. The birth sheet that came with the amp showed that when it was tested it had a RMS power of 650 watts. Only have the amp turned up 1/4 of the way and on certain songs I am afraid to turn it up any more because I don't think the twelves can handle it. For it size and price you will not find a better amp. Clean sound, Great heat distribution, Remote volume level (punch level), and Crutchfield lifetime tech support, you can't go wrong.

Pros: Price, Sound

Cons: The light on the remote volume control is to bright for night. Nothing that a black sharpie couldn't fix.


Written By AScottE527, Virginia Beach, VA on Wednesday, July 09, 2014

Crutchfield Customer Review (What's this?)

Perfect Mono Block amp for the price! This powers my 10inch Rockford like its nothing.

Pros: Easy hookups and nice clean power an runs relatively cool.

Cons: None

2 r500x1d on 2 15" soundstream r2's

Written By synister audio, madras oregon on Monday, June 23, 2014

I originally bought 2 of these little amps to get through till i got my alternator in so i can run my big amps. That was some 5 or so months ago now and i refuse to switch them out. I have 2 of these each pushing a 15" soundstream r2 and they do it with no effort what so ever at only 5 out.of 11 they are almost too much for the subs. When they came in i opened the box and seen first off the birth sheet stating 620 rms watts and i couldnt believe it. I have both along with my bass processor mounted under the back 40 side of my 60/40 split bench with room to spare and even with both right next to each other they never get even remotly warm even after hours of continuous play time. Absolutly no issues with this amp and couldnt be more then pleased and for the money i promise you can not find a better deal. Will soon be purchacing 2 more of these and 2 of the 1000's for my test bench. Buy this and never buy another amp again. Keep ot up rockford im a customer for life.

Pros: Small in size, big in power, runs cool, mounts anywhere, made by the best. Great sound quality, includes remote and packs at least 120 watts rms more then stated

Cons: Only complaint is i wish it was 1 ohn stable so.i could suck out a few more watts but when i wire my subs too 1 ohm the light goes red, at 2 ohns tho no issues

Great amp

Written By Rob, Nelson Va. on Wednesday, March 05, 2014

Plenty of power it looks good and is compact.

Pros: Power

Cons: None

Great Amp

Written By Seth, Jackson Missouri on Wednesday, December 04, 2013

I have this amp powering a Rockford Fosgate P2D4 12" sub and WOW. The sub is rated at 400rms, my amp gain is on 4.5 of 11and im afraid to turn it up any more! I love this amp! Very powerful! I even drive to my cabin an hour away listening to my music and amp never remotely gets warm

Pros: Small, Powerful, looks great, runs very cold

Cons: not a single thing

Rockford Fosgate R500X1D

Written By Nate, Denver Co on Monday, September 30, 2013

This amp is awesome. Everything I expected plus some. It powers my subs great and runs really cool.

Pros: Great amp, lots of power, crisp clean sound

Cons: None

Hands-on research

What's in the box?

Download owner's manual

  • Mono subwoofer amplifier
  • Remote Punch Level Control module
  • 18' Remote Punch Level Control cable (RJ-25 connector on both ends)
  • 6" Speaker level input harness
  • 3mm Allen wrench
  • Four 3/4" Self-tapping screws
  • Two 1/2" Self-tapping screws
  • 4 Flat washers
  • Installation & Operation manual (English/ French/ Spanish/ German/ Italian)
  • Amplifier verification certificate

Product Research



Overview: The Rockford Fosgate Prime R500X1D Class D mono amplifier is designed to power subwoofers. The Class D design and extruded aluminum heatsink allows the amplifier to run cool and efficiently, and results in a small footprint.

CEA 2006 Compliant: The R500X1D's power ratings are measured according to the uniform standards advocated by the Consumer Electronics Association (CEA). These standards allow you to accurately compare the rated power output and signal to noise ratio of 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: 300 watts RMS x 1 at 4 ohms, 14.4 volts, and less than 1% THD+N
  • 2 Ohms: 500 watts RMS x 1 at 2 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 a preamp level signal, 450mV to 12V when using a speaker level signal.

Remote Punch Level Control: The R500X1D includes a wired Remote Punch Level Control, 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. The Remote Punch Level Control features a rotary dial, and comes with mounting hardware and an 18' cable.

Note: The Remote Punch Level Control measures approximately 1-3/4" wide (2-5/8" including the mounting flange) x 3/4" high x 1-5/8" deep (2-1/8" deep including the knob and wiring).

Crossover: The amplifier is equipped with a 12dB/octave Butterworth low-pass crossover. The crossover point is continuously variable from 50 to 250 Hz. This being a subwoofer amp, the crossover is always engaged.

Phase: The 2-position phase switch allows you to easily reverse the output phase of the amplifier, choose 0° or 180° to match the rest of your vehicle's speaker system.

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 AWG power and ground wires.

Fuse: An external 50-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 50-amps, the original should be replaced with a 50-amp fuse. When not using a wiring kit, the v6-MANL fuse holder (item number 120MANL, sold separately) and MANL50 50-amp fuse (item number 120MANL50, sold separately) can be used.

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 one pair of speaker outputs is 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.

Wired Remote: An RJ-25 jack is used with the included Remote Punch Level Control.

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.