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Rockford Fosgate Prime R500X1D

500W RMS Prime Series Class D Monoblock Amplifier

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General Features:


  • Prime Series Class D Monoblock Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 300 watts x 1 chan.
    • 2 ohms: 500 watts x 1 chan.
  • CEA-2006 compliant amplifier
  • Efficient Class-D circuit topology
  • 12dB/octave Butterworth crossover
  • RCA pass-thru outputs
  • On-board Punch EQ with +18dB boost @ 45Hz.
  • High level inputs
  • Remote PLC (Punch Level Control)
  • 0°/180° Phase Switch
  • Real time output and power supply thermal sensing

  • Cast aluminum heatsink
  • 4 Gauge power/ground connectors
  • MOSFET power supply
  • Over current protection
  • Short circuit protection
  • Muted turn on
  • Frequency Response: 20 - 250 Hz +/- 1 dB
  • Efficiency: 89% @ 4-ohm
  • Total Harmonic Distortion: <1.0%
  • Signal to Noise Ratio: >100 dB
  • Damping Factor: >200 dB
  • Input Sensitivity: 150 mV - 4V
  • Recommended Fuse: 50A x 1 (not included)
  • 8-gauge speaker wire terminals
  • 4-gauge power and ground wiring is recommended for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.
  • Dimensions: 8.50"L x 6.80"W x 2.00"H
  • Authorized Internet Dealer
  • 90 Day Sonic Electronix Warranty

Check out the Rockford Fosgate R500X1D Owner's Manual


Second Depth
The second depth is used only when the box is slanted or angled. This value is the top measurement and it is measured in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
The height of the item, measured from top to bottom, in inches.
The width of the item from left to right (side-to-side) measured in inches.
Color of handle.

Warranty and Return Policy

Parts Warranty Duration
90 days
Labor Warranty Duration
90 days
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

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Average Attribution Rating

Browse 35 questions and 145 answers
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Why did you choose this?
Sonic Electronix Store
Love RF products. Had great reviews. Power ratings equally match sub I lm also purchasing
Douglas B on Jan 18, 2017
Have one already good performance for the miney
James G on Jan 7, 2017
You always get more than rated power and then some. Rappers been talking bout Fosgate since the 80's 90's etc. Fosgate has been around the longest and still holding its own some 40 yrs later. The new CP's... what other amp has constant power?? Ill probably be a loyal Fosgate customer for life.
Mike Oh on Jan 12, 2017
It's a Bad Mo Fo!!
Matt M on Dec 21, 2016
can you run this amp at 2ohms to 2 2ohm subs?
trentf150 on Dec 4, 2014
Best Answer: I have mine running to 1 rockford p2 12 inch sub at 2ohms if you want full power on both of your subs you'll probably want two amps or a amp with higher watt output
Reply · Report · Avery G on Dec 4, 2014
can this do 1 12 inch p3 healthy? every birth sheet I have seen it does 630 watts rms+ and that's more than the rms for a 12 inch p3
A shopper on Jan 29, 2015
Best Answer: Hello,

As you have noticed by now, you are going to get very different replies. This is due to the fact that you haven't provide enough detailed information to provide a solid uniform answer. " 1 12 inch p3 " is only a description; It's great that we know the size and series, but what model is it?
The 500X1D is commonly matched up with one Rockford Fosgate P3D4-12 ; so if That is the model you are referring to, then we say go for it! =]

For future inquiries, please make sure to provide a proper Model Number, not just a description. This is so you can be given accurate answers.
Reply · Report · Customer SStaff on Feb 2, 2015
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I have a 1968 C-10 Truck and are running a custom autosound with 300 Watts Peak featuring 2 Channel RCA Auxiliary Input for Satellite etc, 4 Channel RCA Pre-outs and Subwoofer Line out w/Level and x-over Adjustments with (2) 6in Pioneer Speaker 120 watt speakers, w/ (2) 200 watt 8" woofer and 2 Piezo tweeters and a 40 watt Dash Mount Speaker. Also, i'm running (2) 10" sub woofers, What amp would you recommend or would i run multiple ones. I've seen a lot of people recommending the Rocksford Fosgate Punch 300 series with this radio. Can you help?
chefcorymac on Aug 2, 2014
Best Answer: I would need your equipment specs (speaker RMS wattage,IMPEDENCE, model, manufacturer ) this R500xd in question is a mono amp meant only for subwoofers. If you use this for your two tens depending on final impedance of the two tens then this amp is plenty powerful for your build. If you would like further recommendations from me please ask! Hope this helps. Birth sheet on amp was 678 watts if I remember right, plus it's really small which is awesome
Reply · Report · david w on Aug 2, 2014
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could this power 2 p1s2-15?
trentf150 on Dec 4, 2014
Best Answer: I have no clue at all haha sorry man. Just give them a call and they will help you out. All the guys are way friendly and extremly helpful
Reply · Report · alex a on Dec 4, 2014
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could this amp power 1 10 inch p3 at 2 ohms healthy? this amp does 500 rms and the sub is 500 rms 1000 watt max will it be healthy for the subwoofer?
A shopper on Nov 16, 2014
Best Answer: Yes peak numers really does not matter its rms that is important you want to send the same rms from the amp as sub although for the best peformance you want to give it some head room and send about 10-15% above rms to the sub . Rockford fosgate always underates there amps even the prime series so this would work very well for you set up .
Reply · Report · Caleb N on Nov 18, 2014
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i have 2 10 inch subs i got from some old home tower speakers they are both 8 ohms if i ran 2 sets of speaker wire from the amp to both of them would it harm the amp? or if i just ran one?
A shopper on Nov 12, 2014
Best Answer: The Fosgate R500X1D is rated at 300W X 1 @ 4 Ohms and 500W X 1 @ 2 Ohms. The reason it is 300W X1 and 500W X 1 is that this is a mono amp which only has one channel. With your (2) 8 ohm speakers you will be able to achieve a 4 Ohm load on the amp by taking the positive lead from each speaker and wiring them to the positive lead on the amp and by taking the negative lead from each speaker and wiring them to the negative lead on the amp. This is called parallel wiring and the formula is as follows:

Rtotal = (R1R2) / (R1+R2), so in your case (8*8) / (8+8) = 64 / 16 = 4

Do a Google search on car audio sub wiring and you should come up with all kinds of good reading.

Hope that helps.
Reply · Report · Darren B on Nov 13, 2014
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I sold the car that this amp was in and forgot to get the remote. I want to install this in the car that I have now. Will the amp still work without the remote?
Kirk A on Sep 22, 2014
Best Answer: Hello Kirk,

Absolutely; you just will not be able to adjust the Gain/Level 'on the fly'. You can regain that feature by picking up a Universal Remote Level Control like the NVX XBRC;
Reply · Report · Customer SStaff on Sep 22, 2014
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what is the max power rating wired at 2ohms?
Michael H on Aug 24, 2014
Best Answer: Hey Michael this is Caleb N. glad I could help . This sub is rated at 500 watts rms which is continous power . Rockford amps are underated so it will push alittle more then that . A tip I would give is make sure the subs you are running are 2ohm stable also make sure to give the speakers about 10-20% over rms you want to give speakers head room when you are wanting to crank it up not the bare minimum .
Reply · Report · Caleb N on Aug 29, 2014
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is this amp 1 ohm stable?
Scott A on May 19, 2015
Best Answer: Hello Scott,

The description has all the information on the amplifier. As you will see, there is no 1ohm rating, therefore implying that the amplifier is NOT 1ohm Stable.
Reply · Report · Rick MStaff on May 19, 2015
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will this amp be enough for 1 p2d2 8 rockford?
A shopper on May 10, 2015
Rockford Fosgate R500X1D
Rockford Fosgate R500X1D
Rockford Fosgate P2D2-8
Rockford Fosgate P2D2-8
Best Answer: Hello,

The setup must be wired in SERIES to a 4ohm load!! The response saying it must be "2ohm" is incorrect and is impossible to accomplish. =]
Reply · Report · Rick MStaff on May 10, 2015
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Will this amp power my two 300 watt 2 ohm 12 inch kicker subwoofers?
JGrocks18 on Apr 11, 2015
Best Answer: Yes, if they are single voice coil then the amp should be pushing more than 300rms at 4 ohm. If you have the dual voice coil wired to 2 ohm then you will have plenty of head room for more. I know the power rating for this amp are underrated. Mine came with a birth sheet claiming 639 RMS at 2 ohm.
Reply · Report · Adam M on Apr 11, 2015
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I got a kicker comp r 12" sub to go with this amp. The sub says its a 2 ohm sub, but the switch on it only has 1 or 4 ohms to select. Which setting should it be on?
A shopper on Apr 2, 2015
Best Answer: Hello,

Stephen has provided the best answer. Assuming you only have One subwoofer, then you MUST put the switch to 4ohms. Switching over to 1ohm WILL damage the amplifier. Also, the sub does NOT "say its a 2ohm sub", it likely says DUAL-2ohm. Unfortunately, you may want to consider changing out the subwoofer for the Dual-4ohm, to get the proper figures you seek. If you've purchased these products from us recently, give our sales team a call for help.

[For future inquiries, please make sure to provide a model number, not a description.]
Reply · Report · Rick MStaff on Apr 3, 2015
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is this amp too big for sum 8inch p2 ?
kenneth on Jan 3, 2015
Best Answer: Hello Kenneth,

For future inquiries, its important that you specify the exact model number of the subs. Your description can literally one of two current models, and one of NUMEROUS previous models. All the answers you are getting will be wrong and detrimental to your setup if you are implying any model that is not the Rockford Fosgate P2D2-8 . Please make sure you go with two Rockford Fosgate P2D2-8 . The Rockford Fosgate P2D2-8 wired in series/parallel will give you a 2ohm final load, making it a PERFECT match for the R500.
Reply · Report · Customer SStaff on Jan 4, 2015
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can you guys recommend single 10'' subwoofer for this amp? I want install this amp on 1991 Toyota truck single cab so my only possibility is use a angled box. If is possible I want to know one 4 ohms 300w or the one with 500w at 2 ohms which is the best to match up? thanks
Nando on Mar 28, 2015
Best Answer: JL Audio 10w3v3-2. This sub matches the amp perfectly. W3 subs are made in USA and JL tends to perform better in smaller boxes than any other
Reply · Report · Tommy L on Mar 28, 2015
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I have this amp and the orange light is on and no sound out the subs. What is wrong?
BigCajun on Jan 8, 2015
Best Answer: How many volts are you pumping to it and do you have it properly grounded?
Reply · Report · Kathleen E on Jan 8, 2015
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if I have 2 2ohm subs hooked to this will it give 250 watts rms to both channels??
A shopper on Dec 17, 2014
Best Answer: In short no. This is a mono block amp which means it only has one channel. If you were to connect both of your 2 ohm subs to it you would have to wire them in series which would produce a 4 ohm load at which the amp only makes 300 watts which would be 150 watts per speaker. If you wired them in parallel it would produce a 1 ohm load which will most likely mean the amp will spend the majority of the time if not all in protect mode.
Reply · Report · Darren B on Dec 17, 2014
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Is there a subsonic filter built into the amp which will allow me to safely run this amp with a ported box?
christian a on May 19, 2016
Best Answer: There is no subsonic knob but I have a vented box for my Sundown sa 8 d4. It plays good the gain knob is not even pass 2
Reply · Report · ceon s on May 23, 2016
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Can I wire 2 Rockford Fostgate R2D2-12 (4 Ohm) subwoofers to this amp in a 2 Ohm configuration so each sub will be hitting 250 Watts?
therealest on Mar 14, 2016
Rockford Fosgate R500X1D
Rockford Fosgate R500X1D
Rockford Fosgate R2D2-12
Rockford Fosgate R2D2-12
Best Answer: This would be perfect, and will do absolutely no harm to the subs as it is split. In a system like this it is best to match your RMS rather than go above it which will not only limit your power capabilities but also over stress your amp due to running 100% all the time pending the type of music. It is easier to tune down rather than overrun everything else to meet power requirements...
Reply · Report · Fred G on Mar 14, 2016
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Is it ok to run this amp at 8 ohms?
anthony c on Feb 20, 2016
Best Answer: Hi Anthony,

You've received contradicting information, so we're going to step in:

Yes, you can. Although there is no rating (and we can't provide one) you CAN run the amplifier at anything ABOVE its lowest stable impedance, including 8ohms.
Reply (1) · Report · Rick MStaff on Feb 21, 2016
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will this amp. run 4 pioneer 325 watts speakers?
Terminator on Feb 19, 2016
Best Answer: Need more specific 325 max or rms...number of voice coils...impedance....etc
Reply · Report · Tommy L on Feb 20, 2016
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Will i need a capacitor if i bridge this amp to two subs? They're 250 watt rms as 4 ohms
Shaun G on Dec 16, 2015
Best Answer: Hi Shaun,

This amplifier doesn't require very much power to perform well, therefore a capacitor will likely not be needed.

Also, you cannot "bridge" an amplifier to a set of subwoofers. Silly semantics, but we want to make sure you communicate with the community with the appropriate jargon. =]
Reply · Report · Rick MStaff on Dec 17, 2015
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I have a NEW ROCKFORD FOSGATE P3D2-12 12" 600 WATTS DUAL 2-OHM CAR SUBWOOFER Will this amp be fine or should I have gotten a 4 ohm speaker?
Kendal T on Jun 10, 2015
Rockford Fosgate R500X1D
Rockford Fosgate R500X1D
Rockford Fosgate LS-P3D2-12-OBC
Rockford Fosgate LS-P3D2-12-OBC
Best Answer: Hello Kendal,

The Dual-4ohm , wired in parallel to a 2ohm load, would be the proper match. However, Rockford Fosgate does suggest that the subwoofer can work well with 300W - which is what your driver would get, wired in Series to 4ohms - but clearly this wouldn't be the 'optimum' power .
Reply (1) · Report · Rick MStaff on Jun 10, 2015
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How long is the remote bass control wire on this?
A shopper on May 5, 2015
Best Answer: Too long. Seriously, unless you're driving a limousine, I promise you'll be just fine with plenty to spare. Can't give you an actual number for it's length because I never measured. My car is a 2013 passat. Amp in the trunk, control under my dash. Still have enough wire to reach the emblem on my bumper
Reply · Report · joseph a on May 5, 2015
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Is this amp be a good match for two of these? I won't be under powering or over powering them right? Also has anyone tried these in this enclosure or even tried the enclosure itself? Finally is this overall a good first budget setup? And if you could recommend me with a good amp wiring kit for this setup that would nice too. Sorry for all these questions as you could probably tell, I'm a audio noob. Thanks in advance.
thirdwardtx713 on Apr 4, 2015
Rockford Fosgate R500X1D
Rockford Fosgate R500X1D
Kicker 10C12D4
Kicker 10C12D4
Best Answer: The amp would have enough power if the subwoofers were a different impedance. The subwoofers are have dual 4 ohm voice coils, this can be intimidating to someone who is new to car audio. Simply put, when you connect the subs to the amp, the subs will be wired to 1 ohm (so will speak in a 1 ohm language) where that amp will put out 500 watts at 2 ohms. So what you will need is either two dual 2 ohm subs or two single 4 ohm subs. I would suggest these subs wired in 2 ohm.

If you need help with the wiring, feel free to use sonic electronix wiring diagrams

As far as the box goes, it's a nice box but it's a little small for you. These subs require 1.75-2.25 cubic ft per sub in a ported box and ported boxes are better when they're built specifically for a subwoofer. I would suggest this sealed box instead.

For a wiring kit, I suggest this one. And you can save a few bucks on it when you buy it with the rockford amp.
Kicker 40CWD122
Kicker 40CWD122
Belva BAK42BK
Belva BAK42BK
Reply (1) · Report · Adam L on Apr 5, 2015
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I have 2 10 inch Rockford r1s the 2015 model their stats are 200 watts rms a piece and 400 watts max so 400 watts rms and 800 watts max if I wire them to 2 ohms will 500 watts be overpowering them or will it work good?
A shopper on Mar 26, 2015
Best Answer: Hello,

Unfortunately, you won't get accurate enough information to answer your question, because you did not provide the information we need. A description of the subwoofer isn't going to help, unfortunately. You managed to omit the important part of the description, the Configuration. Assuming your drivers are Dual-2ohm , then wiring them to a 2ohm load is perfectly fine, because the amp will provide ~250w RMS to Each.
Reply · Report · Rick MStaff on Mar 26, 2015
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i have the p2-2x12 800 watt RMS and 1600 watt max would this be a good amp or a something larger?
Steven H on Apr 15, 2016
Rockford Fosgate R500X1D
Rockford Fosgate R500X1D
Rockford Fosgate P2-2X12
Rockford Fosgate P2-2X12
Best Answer: Hello Steven,

The R500X1D is not 1ohm stable so it is not compatible with the enclosure. We suggest one of the two amplifiers that is recommend on the enclosures product page. (and yes, they are "larger")
Reply · Report · Rick MStaff on Apr 17, 2016
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I am looking at the R500X1D does this amp get very hot @2 ohm load during long listening sessions?
A shopper on Mar 19, 2016
Best Answer: Any amplifier will get hot after long periods of play time. Your electrical is something you should keep in mind when adding amplifiers etc. This is a great amplifier, however I don't have all the information needed to answer the question fully. Need to know what subs you are using etc. Read the RMS ratings per ohm load with the amplifier and match that to the RMS of the sub/subs. I.E. 500 watts RMS on one 10 that can handle 500 watts RMS , or 2 10's that are 250 watts RMS each . This amp is capable of handling a 1 ohm load.
Reply · Report · Chris P on Mar 20, 2016
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Will my rockfordfosgate p3 fit this? I am running a 2ohm sub to a 2ohm mono amp can I just run both signal wires to both terminals without having to use the other side as well?
Chris on Mar 2, 2016
Rockford Fosgate R500X1D
Rockford Fosgate R500X1D
Rockford Fosgate P3D2-12
Rockford Fosgate P3D2-12
Belva 1SV12G
Belva 1SV12G
Best Answer: Hi Chris,

Fitment, Yes.

- I am running a 2ohm sub to a 2ohm mono amp can I just run both signal wires to both terminals without having to use the other side as well?

The Rockford Fosgate P3D2-12 is NOT a "2ohm sub" and the R500X1D is NOT a "2ohm amp" . The subwoofer is a DUAL-2ohm subwoofer and it is very important that you make that distinction. As for the amplifier, although it is Stable to as low at 2ohms that does NOT mean we call it a '2ohm amp'. As for the second part of your question, Absolutely Not! Doing so will deem the setup improper use and will void your warranty. We suggest the P3D4-12 if you want to run that amplifier.
Reply · Report · Rick MStaff on Mar 2, 2016
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Does the high level inputs also double as a remote turn on? I am planning on adding this amplifier to a car that has a stock head unit. Was hoping for a convenient install. Thanks
Grant on Oct 17, 2015
Best Answer: No. You will have to tag an ignition or accessory wire and run it to the amp. Make sure you fuse it online with a 5 or 10 amp fuse. Doing this adds less than 30 min and will make for a nice clean install.
Reply · Report · david w on Oct 21, 2015
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Can I pair this with two polk DB 12's pushing 720 rms? My buddy has this amp and says RF advertises their wattage lower than what they can actually put out.
Connor K on Oct 14, 2015
Best Answer: Hello Connor,

Please provide a proper model number (of the subwoofers) so we can provide an accurate response. =]
Reply (1) · Report · Rick MStaff on Oct 15, 2015
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I purchased this amp the other day. The problem is that it's only putting out a small amount of power. The amp before was some cheap 300w 2 channel Planet Audio mated to my 2ohm 400 rms Pioneer Premier sub. It hits good, but I wanted something a bit more punchy. Im currently running 8 gauge walmart power and ground through my car. I connected my new RF to everything and the blue light turned on. However it was putting out a very small amount of voltage. The ground and all fuses are good. My guess is that it need 4 gauge instead of 8?

*Tested with my friends system running 4 gauge, it worked great when that happened.
Travis S on Oct 12, 2015
Best Answer: Hello Travis,

There is absolutely no doubt that 8 Gauge of cheap discount wiring is not going to provide enough juice to a proper amplifier, like the R500X1D . We, and Rockford Fosgate, highly suggest investing in wiring that matches the performances of the amplifier; that is, 4 Gauge OFC wiring. However, this suggestion isn't implying that it is going to fix your problem. There are a few more variables involved, and you didn't provide enough information to touch them all. (it would be almost impossible to do so through this medium) .
Get back to us after you've upgraded your wiring, and please make sure to Then provide proper model numbers, not descriptions. For example, "2ohm 400 rms Pioneer Premier sub" can mean just about anything, and doesn't help us conclude that this is a compatible driver. In fact, if the driver is a Single-2ohm, it would Not have ran very well on a 2-Channel amplifier, but then you might mean something completely different...point is, we need a model number next time =]
Reply · Report · Rick MStaff on Oct 13, 2015
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please can someone tell me the difference between Rockford Fosgate Prime R500X1D vs Alpine MRV-M500 for single sub-woofer Alpine SWS-10D4 witch is better?. Thanks a lot!!
Nando on Aug 9, 2015
Rockford Fosgate R500X1D
Rockford Fosgate R500X1D
Alpine MRV-M500
Alpine MRV-M500
Best Answer: They have similar (if not the same) specs in terms of power output.
The RF has a slightly smaller footprint (barely) than the alpine.
The RF includes a "remote punch level control" which is a knob to control the level of bass, alpine's equivalent (RUX-knob) is sold separately.
But it's always nice to have matching brands of subs and amplifiers.
The RF is cheaper too..
I have 2 MRV-M500s though and they haven't disappointed me at all.. Haven't seen the RF in action to judge
Reply · Report · Daniel C on Aug 10, 2015
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What is the true rating for the amplifier at 4 ohms? Because I know it is more than 500 at 2 ohms so I am curious on what it truly is a 4 ohms
Sadiq L on Apr 22, 2015
Best Answer: At 2 ohms the birthsheet states 517 and 4 ohm is half of that so at 4 ohm the amp would be doing 258rms watts.
Reply · Report · santos m on Apr 22, 2015
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Will this amp run my JL Audio HO208G-W3v3, 2 8's in a JL box? Or would it do better with 1 sub only?
Stephen S on Dec 5, 2014
Best Answer: Hello Stephen ,

The Rockford Fosgate R500X1D is a perfect match for the JL Audio HO208G-W3v3. The JL Audio HO208G-W3v3 requires ~500w RMS @ 2ohms, and the R500X1D provides Exactly that.
Reply · Report · Customer SStaff on Dec 6, 2014
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Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Rockford Fosgate Prime R500X1D