No more dim lights and great sound quality!!!
Rockford Fosgate RFC1D 1 Farad Capacitor
Energy Storage Reinforcement Capacitor with LED Voltage-Display
- Display Color: Blue
- Hybrid 1.0 Farad Digital Stiffening Capacitor
- Delivers constant power to your system
- Increases quality of sound
- Increases level of bass
- Reduces dimming headlights
- Platinum plated
- Solid brass top helps reduce stripping
- Authorized Internet Dealer
- 1-year Manufacturer's Warranty
Warranty and Return Policy
Summary of Customer Ratings & Reviews
August 20, 2011
59 of 69 found this helpful
San Diego, CA
August 3, 2009
i have a mrp-m500 powering a 12" type r and im having less dimming and a slight difference of louder bass. if your pushing less than 1000 rms id recommend it. before when i didnt have this cap my headlights and lights on the dash would dim ALOT. now my electrical system for my car runs smooth, my speedometer is brighter and my headlights. but my headlight do dim just a little. btw im running with a stock batt. alt. and no big 3.
55 of 64 found this helpful
February 18, 2009
This Rockford Fosgate capacitor is a must have if you are into custom stereo equipment ,there are only pros except for having to buy it that's the only con and even the price was great so that's not too bad !! There's a digital reading that shows your amps which allows you to know when your battery is getting low or if your alternator is about to crash , I had a system with 750 watts rms prior to buying this cap and after installing it i could turn it up loader without my battery being drained and the headlights dimming !!!!! Like I said A MUST HAVE!!!!!!
55 of 65 found this helpful
January 15, 2013
This works like a champ! I have this hooked up to a HiFonics 1200 Brutus amp, pushing 2 Rockford Fosgate 12 inch P1's. No light dimming at all. No lacking in amp power ever! Didn't have to upgrade my alternator or battery with this bad boy. And it lights up blue to match my amp lights. Buy this product. Nothing but good things.
51 of 59 found this helpful
December 17, 2012
I like to tell people alternator alternator alternator. In my case it's two stock 130 amp 3G alts. 2 mb quart reference amps strapped putting out 1600 watts rms. and I have 2 70x4 amps playing active biamped jl c5 components. I didn't have a problem with low voltage when I cranked my stereo I had a problem with the lights dimming when the bass would hit and the quick spike would come and go making my voltage gauge dance, and my lights would flutter. With the addition of two capacitors the voltage is much more stable. The amps take the power stored in the caps when it hits and the feed of power progressively rolls back in to charge the caps acting like a buffer. If your charging system can't keep up In the first place a cap will not help you.
52 of 61 found this helpful
January 18, 2012
I've sat in my car for almost 2 hours before with the car off, just blaring my system, and my battery was just fine. My lights don't dim when it hits and I'm pushing 3,000 watts into 2 JL's. This rocks, 5 of 5.
51 of 61 found this helpful
January 23, 2012
First off it does what it says and is a very solid cap kept my voltage steady and did improve on my bass sound quality the led voltmeter is also very nice. Its easy to install and will fit 0 gauge wire I charged it with a 12v car lightbult like the ones from the taillights.
Overall I would recommended this for small sound systems and to make your setup look better.
48 of 56 found this helpful
August 18, 2011
This Rockford Fosgate capacitor is a must have I own 2 for 2 different systems. Keeps lights from dimming, Two system at 1600 no problems at all!!
51 of 62 found this helpful
Sherman Oaks, CA
June 1, 2010
I just got my system installed about 2 weeks ago and this really helps a lot. It maintains the cars voltage and keeps my 2 12" p3 subs going full tilt. Excellent buy.
48 of 58 found this helpful
July 29, 2009
This capacitor is a must have for any system! I'm running two amps off of it actually for ~700 watts RMS and I haven't had any problems. It's hooked in parallel with my system, connected to my distribution block and grounded to the frame. I didn't use the charger to charge it as it said. I just let it charge itself when I connected the battery back up. Just be careful, that's a lot of juice stored up!
47 of 56 found this helpful
October 3, 2013
I am always the one to say alternator, alternator, alternator. However, for my specific application, an aftermarket alternator was not an option. I am pulling roughly 70 amps of current and my 130 amp alternator was struggling to keep up even with the Big 3 in all 1/0 OFC and an Optima Yellow Top Battery. After adding this capacitor, my voltage stays above 14 volts all the time. I guess capacitors only work if you buy the best, rockford is awesome. On a side note, make sure you provide your amp and capacitor with separate grounds rather than utilizing the ground distribution block on the capacitor.
47 of 57 found this helpful
Glen Gardener NJ
February 6, 2012
Personally I never had a thing for capacitors. Unfortunatly due to a low budget, I couldn`t afford the "big three" or even a new alt... but Rockford does exactly what it`s supposed to do. The sound quality of my Type R is way better than it was. Completely cancelled out all the dimming too! I think people get the wrong impression about the capacitors... by no means should it make your sub louder. It's not a miracle machine its honestly a cheaper solution to fixing the issues that our unnecessary and booming systems throw at us! Not every one has the money to buy a beefy alternator or top of the line battery. Any way, like I said.. it does what it's supposed to and i highly recommend this product. Looks sweet too!
47 of 58 found this helpful
Fort Myers, FL
August 18, 2009
This cap is truly one of the best. Built very solid, never had a problem of any kind with it. It is a little pricey, i think, for a 1 F. But if you want the best, and your system isn't too massive, go with this one.
46 of 56 found this helpful
October 24, 2012
What can I say, this large beast (Don't be fooled by the battery appearance, it's about the same size as my biceps!) has done me well. Never skips a beat, sound is always crisp, clear and precise.
Features: It is a capacitor, has a little LED thing that shows voltage. Comes with capacitor installation kit so you don't turn your fuse box into the 4th of July.
45 of 55 found this helpful
October 21, 2010
Excellent, no more dim lights.
45 of 55 found this helpful
January 3, 2008
This product seems to perform as intended. I am satisfied with my purchase.
42 of 51 found this helpful
May 1, 2011
Works great and I love it. The only thing I did not realize is the digital readout never turns off regardless if you vehicle is on or off, so at night you can see a blue light coming from within the inside of my truck and its pretty bright. The only reason I do not like this is I have had my truck broken into and robbed, so I do not like the blue light attracting the unnecessary attention, but when I'm in sketchy places i just throw a shirt or jacket over the capacitor to block the light.
41 of 50 found this helpful
November 6, 2010
love it cut down on my light dimming greatly. i still had to do big 3 upgrade because i was runnin jl 1000/1 and 13 w7. great for systems under 1000 watts rms!
42 of 52 found this helpful
April 27, 2015
I have a 500 watt alpine mono amp powering 2 rockford Fosgate 15 inch p1s wired to 2 ohms and this cap works great. Highly recommended
37 of 43 found this helpful
May 9, 2012
A must to have when pushing Amps, especially with all the electronics... Lights don't dim when the bass hits.
41 of 51 found this helpful
April 25, 2013
I would strongly recommend this product for anyone needing this particular piece of equipment. It arrived as it was advertised, and has been working great since I installed it. It's a great choice!
39 of 48 found this helpful
Grand Island, NE
December 4, 2007
I have my kenwood amp pushing out 500 watts bridged mono and i use to dim my headlights and neons like no other. Since i installed this cap, my lights don't dim, i get more bass, and i get too many complements on how my set up looks with it next to my amp. The install was easy, painless, and charging it up was nothing. all in all, this cap is the cap you want.
41 of 52 found this helpful
August 19, 2014
Great product. I would not buy this thinking you are gonna stop dimming lights. You buy this to save your cars electrical system. Came with a great charging board. It doesn't light up when charging. So just wait for the light to go out before throwing your fuse in.. Great product. I'm running this on a Sony gsx gs100. Amp to 1100 watts on a regular p3 sub, with 2p3's on a soundstream amp with a stinger 5farad cap.
39 of 50 found this helpful
August 19, 2008
This is a must have piece of equipment for every stereo system that has an amplifier!!!! I always had an issue with my electrical system, until now. Now I have no issues at all in fact I my headlights dont dim and it feels like my bass has a harder hit to it, and I thank sonic for that !!!!
32 of 41 found this helpful
April 30, 2018
Profuct is great! I would buy two of them if I needed another
0 of 0 found this helpful
April 26, 2018
I’m a huge fan of Rockford Fosgate and my entire car audio systems is comprised of all RF equipment, right down to the wiring, with the exception of the head unit. This is just another piece of their great equipment. Great digital readout, easy to use and easy to charge with the accompanying charging tool. Along with that, it works great and also looks really cool too and Sonic Electronix price was better than any other competitor!
0 of 0 found this helpful
gering ne 69341
May 12, 2016
Very helpful in helping me choose the right one for me and advice on hooking it up preciate all your help thank you
0 of 0 found this helpful
December 16, 2015
I would recommend this to all my friends 2 of my friends bought this cap after they saw what it did for my system I have two amps on this a jbl with 300 rms and a fli audio amp at 600 rms and this thing handles them both no problem (pros) great power and look great in my truck (cons) none
0 of 1 found this helpful
Internal Product ID
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.