Rockford Fosgate RFK4D

4-gauge dual amplifier complete wiring kit

Item #: 575RFK4D

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31 Reviews | 1 question - 4 answers

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This kit includes patch cables and speaker wire for installing two 2-channel or mono amps — you'll need to add cables and speaker wire if you're installing a multi-channel amp along with a second amp.

Your amp needs big power wires in order to deliver top performance to your sound system. Rockford Fosgate's RFK4D amplifier wiring kit supplies everything you'll need to send power and signal to two amps and your speakers. It's designed for amplifiers with fuse ratings totaling up to 100 amperes.

The kit includes two distribution blocks, 4-gauge power and ground cables, 8-gauge power and ground cables, speaker wire, two patch cables, a fuse holder, a 100-amp fuse, and more. Rockford Fosgate makes these cables from 100% pure crystal-oxygen free copper wire so you can count on maximum signal transfer.

Product Highlights:

  • dual amplifier wiring kit
  • cables meet or exceed the American Wire Gauge specifications and requirements
  • 17 feet of 4-gauge power cable
  • 6 feet of 8-gauge power cable
  • 3 feet of 4-gauge ground cable
  • 6 feet of 8-gauge ground cable
  • 20 feet of 18-gauge turn-on lead wire
  • two 16-foot twisted pair RCA patch cables
  • 30 feet of 16-gauge speaker wire
  • MAXI fuse holder and 100-amp fuse
  • two 4-gauge to 8-gauge distribution blocks
  • assortment of wire termination hardware and cable ties
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research

What's in the box?

Download owner's manual

  • 17' Power cable (4-gauge) in a red translucent jacket (has an in-line MAXI fuse holder and a ring terminal on the battery end)
  • 3' Ground cable (4-gauge) in a gray translucent jacket (with a ring terminal on one end)
  • 6' Power cable (8-gauge) in a red translucent jacket
  • 6' Ground cable (8-gauge) in a gray translucent jacket
  • 2 Distribution blocks (One 4-gauge in/Three 8-gauge out)
  • Two 16' twisted pair RCA patch cords
  • 30' Length of 16-AWG speaker wire
  • 20' Length of turn-on lead in a blue jacket
  • Ten 4" wire ties
  • Plastic bag containing the following:
  • Crimp-on ring terminal for 4-gauge wire
  • Large black rubber boot
  • 100A MAXI fuse
  • Plastic 4 gauge-sized grommet
  • 2 Red plastic butt connectors
  • 5 Crimp-on female 0.25" quick slide connectors
  • 5 Crimp-on spade connectors
  • 3 Red rubber boots
  • 2 Black rubber boots
  • Decal with model and serial numbers

Product Research

Features

General Overview: This is a dual amplifier wiring kit that includes 4-gauge and 8-gauge power and ground cables, power distribution blocks, turn-on leads, two pairs of stereo RCA cables, a 30' length of 16-AWG speaker wire and other accessories required to install two amplifiers.

High Strand Power/Ground Cable: The power and ground cable are 100% Pure Crystal-Oxygen Free Copper (PC-OFC) and meet or exceed AWG (American Wire Gauge) requirements. For example, the included 4-gauge power and ground wires each have 1,862 copper strands, compared to the 735 copper strands which meets the standard.

In-line Fuse Holder: The included in-line fuse holder attached to the power cable comes with a 100-amp MAXI-type fuse.

Power Distribution: The kit includes two unfused power distribution blocks. Each block has a single input and three outputs. There are insert sleeves that allow you to use multiple sizes of wire: a 1/0 gauge-to-4 gauge sleeve for the input, and three 4 gauge-to-8 gauge sleeves for the output.

Patch Cables: There are two 16' RCA patch cables included, each with twisted pair design for noise rejection, and a split center pin that helps secure the connections at both ends.

Speaker Wire: The amplifier kit comes supplied with high strand 16-AWG speaker wire for increased sound transfer.

Accessories: The kit includes the following accessories needed for amplifier installation:

  • Ring terminal for 4-gauge wire and rubber boot
  • Spade terminals for 16-gauge speaker wires with red and black rubber boots
  • Female quick slides for 16-gauge speaker wires
  • Butt connectors for splicing together wires
  • Grommet for routing 4-gauge power wire through the firewall
  • Wire ties for securing wires to the vehicle

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 open the box, verify contents, 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.

Rockford Fosgate RFK4D Reviews

Average Customer Review:

31 reviews
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Amp installing a breeze

Written By FMS, Houston, Tx on Sunday, June 29, 2014

Crutchfield Customer Review (What's this?)

Made installing my two alpine amps a breeze

Pros: Everything you need for installation of 2 amps.

Cons: Need instructions for the fuse block on how to install the fuse. I figured it out but it would of been nice to just have instructions. Need more RCA lines if using multi channel amps.

Amp Wiring

Written By Nick, Austin, TX on Friday, April 18, 2014

Crutchfield Customer Review (What's this?)

It was sufficient for what I needed in regards to 2 amps

Pros: Came with everything I needed to setup two amps.

Cons: The ground wire was not long enough for the second amp had to purchase an additional kit to do the job.

Rockford Fosgate RFK4D

Written By bcarn, phx ax on Wednesday, February 26, 2014

Crutchfield Customer Review (What's this?)

Everything u need. Nothing u don't.

Pros: Quality

Cons: Price: Buy an amp and get half off and its worth it. Inline fuse holder: not water proof and, not that one would think it would be necessary, no instructions. Fuse doesn't fit in until u remove the Allen head bolts from each side of fuse connector.

RFK4D Impressive!

Written By MPH, Boca Raton, FL on Wednesday, October 23, 2013

Crutchfield Customer Review (What's this?)

Excellent quality, nearly complete kit. Installed with confidence.

Pros: Quality, substantial.

Cons: Wish the kit included patch cable for sub and I wish the main power cable was about 3ft. longer to reach all the way back and across the rear of my F150 SuperCrew.

a real complete amp kit

Written By Anonymous, California on Monday, September 02, 2013

Crutchfield Customer Review (What's this?)

This kit has everything you will need for a 4 channel amp instill

Good for a big truck.

Written By Scout Man, Texas on Friday, June 21, 2013

Crutchfield Customer Review (What's this?)

I use this set up to instal two amps in a mega cab truck. Worked out great. Even had a few feet of extra wire to play with.

Pros: Quality product delivers full power to amps.

Cons: None

RFK4D Multi Amp Wiring Kit

Written By mariotn23, Coamo, PR on Thursday, June 06, 2013

This kit comes with all the cables and connectors that you'll need to install your car amps. Cables are high quality and cool looking too. If you have never install stereo equipment in your car you should give it a try because with the owners manual, google and the vehicle specific instructions that the nice people at Crutchfield sends you to you email you should be just fine. Wiring is very important for your amps to get enough juice so this was a necessary investment. Highly recommend this item even if you have one amp for now. Who knows. With this kit additional amps will be a breeze.

Pros: High quality materials, wires, connectors

Really Useful Kit

Written By Mark, Marietta, GA on Saturday, April 27, 2013

Crutchfield Customer Review (What's this?)

All the cables had ample length for my install and even the 4 ga. power and ground cables were very flexible and easy to route thru the car. The only drawbacks, IMO, were the power dist. blocks did not provide or offer any covers for any unused output lug's, and the 8 ga. power and ground wires were not supplied with connectors to connect the cables to the amp(s). Other than these two trivial faults, the kit was fantastic.

Pros: All the cables had ample length for my install and even the 4 ga. power and ground cables were very flexible and easy to route thru the car.

Cons: The only drawbacks, IMO, were the power dist. blocks did not provide or offer any covers for any unused output lug's, and the 8 ga. power and ground wires were not supplied with connectors to connect the cables to the amp(s).

Rockford Fosgate RFK4D

Written By Darrell, Fort Mill, SC on Thursday, April 25, 2013

Crutchfield Customer Review (What's this?)

The Rockford Fosgate amplifer wiring kit was well worth the cost. It came with everything I needed to install my two amps. My installation went very quick do to having everything I needed in one kit.

Pros: Almost everything I needed was in one kit. Plenty of power wire and speaker wire. The junction blocks having holes so I could quickly secure them to the truck.

Cons: The only negative was I did not have the exact connertors to plug in the power to my sub.

350z

Written By Anonymous, APO Germany on Tuesday, April 16, 2013

Crutchfield Customer Review (What's this?)

Had everything I needed and more for the 350z set up

No expense spared!

Written By Tyler S, Frederick, MD on Friday, November 30, 2012

Crutchfield Customer Review (What's this?)

Loaded with everything you will need. The 30ft of speaker wire was plenty for my 2010 Civic sedan (a set of components) and the 4 gauge wire was suprisingly pliable for such a thick cord.

Pros: Everything.

Cons: Only a little pricey.

Really useful, worth the price

Written By Victor, Greenville, sc on Monday, October 08, 2012

Crutchfield Customer Review (What's this?)

The whole kit is well organized, and I had no issues wiring the power wire under the car. However I drive an 01 s40 so a larger car will have to go through the cabin. And put the fuse in on the main power wire before you fasten it anywhere.

Pros: Almost all the cables have tons on length and thickness. RCAs have plenty of length to

Cons: Could have more speaker wire. Distributor blocks takes the 4 gauge, but only sends out 8.

Well worth it.

Written By Tacky, Eastern, North Carolina on Sunday, July 08, 2012

Crutchfield Customer Review (What's this?)

Great buy, got it half price when I bought my RF T-500-1BDCP so the price was great. It has all the gear to setup 2 amps and also leaves room for later additions. I have been using RF wiring for 12 years with excellent results. The wires is greater in diameter than the other brands instead of having a thicker insulation to fool you. Its very flexible and easy to work with. I am skeptical about the open side fuse holder as others are, but I am going to give it a good ole college try. Would also like 20 feet of 4 gauge instead of 17 feet. All in all great kit, great value, and would recommend it, and buy it again.

Pros: Great value when bought with an amp and get it half off. Great quality heavy duty wire, includes almost everything you may possibly need. Very flexible and easy to work with.

Cons: Wish the 4 gauge was 20 feet instead if 17 feet, unsure how long the open main fuse holder will withstand the under hood elements.

Awsome

Written By Devan, Newnan, Ga on Monday, April 02, 2012

Crutchfield Customer Review (What's this?)

Excellent. the distribution blocks are compact and easy to work with.

Pros: has alot of 4 gauge and 8 gauge wire

Cons: if your running speaker wire to crossovers you would want to but atleast another 8 foot of speaker wire

Rockford Fosgate RFK4D - More than too much

Written By 99SAAB9-3, Evergreen, CO on Friday, March 30, 2012

Crutchfield Customer Review (What's this?)

This kit was easy to use & definitely does the job, but it has about 80% more parts than I needed. If I could have bought just a splitter block and the 4 & 8 gauge wiring I needed, I'm sure I could have saved at least 50%.

great kit, more than enough for 2amp, distributions for multiple

Written By Anonymous, clarkston MI on Friday, January 27, 2012

Crutchfield Customer Review (What's this?)

This kit has more than enough material for at least 3amps, the descriptions on the package says it does not include a distribution block BUT there are two blocks which have 3 outputs each. As always crutchfield support is awesome!!

Pros: Too many to list.

Cons: No cons

amp wiring

Written By Parker, Alexander, AR on Monday, July 18, 2011

Crutchfield Customer Review (What's this?)

Great product along with fair pricing. Highly recommend this purchase for stereo upgrades. Covered majority of my needs with one purchase. Only improvement for my install, was to double the amount of speaker wire included. Thanks!

Rockford Fosgate RFK4D

Written By Drew, Chicago,IL on Thursday, June 02, 2011

Crutchfield Customer Review (What's this?)

Great product for wiring up two amps. The only thing I didn't care for was the fuse holder. It doesn't enclose the entire fuse so it is not water tight. Other than that great product.

Rockford Fosgate RFK4D

Written By Ben, Camdenton, MO on Wednesday, February 02, 2011

Crutchfield Customer Review (What's this?)

This was everything I was looking for and needed. THANKS!

The most important parts are of superb quality

Written By aztekk, Tucson, AZ on Friday, September 03, 2010

The actual amp cable is of superb quality. Basically all of the hardware has a top notch feel to it... except the signal cables and the speaker wire.

The speaker wire isn't even copper, it's of a silver color, and is probably some sort of inferior copper alloy. I did not splice open the signal cable, but through the translucent jacket, they too appear to be made of the same stuff.

This is disappointing because these extra pieces are one of the main reasons I went with this kit. (I think this is the only kit with these extras)

If you are getting run of the mill replacements for your stock system, I say use these included cables and wire. But if you're going with top notch components, it wouldn't make sense to these throw-in items. I will be ordering high quality speaker wire and signal cables for my system.

Despite this, the kit is still worth the money.

Rockford Fosgate RFK4D

Written By Anonymous, Aldie, Va on Monday, August 30, 2010

Crutchfield Customer Review (What's this?)

pros:
awesome kit for the price. i am running two amps (a 4 channel and a mono) and i
have no problems with the sound.

cons:
for my 03 mdx, the rca's ran short. and i didnt care much for the fuse. its
rather hard to see once placed inside the holder.

overall, i would strongly recommend. great support as usual from the
crutchfield team.

Great solution for dual amp installs

Written By bronzemfp, Charlotte, NC on Thursday, May 27, 2010

Crutchfield Customer Review (What's this?)

If you have 2 amps to install, do yourself a huge favor and get this kit. I thought it was a little pricey at first, but for everything this kit contains and it's quality overall are well worth it.
I had a single 4 channel amp, and was adding a mono amp for a subwoofer. This kit includes everything you need for a relatively quick and clean install of 2 amps.

Great Dual Amp Wiring Kit

Written By Crutchfield, Slidell, LA on Thursday, July 23, 2009

Crutchfield Customer Review (What's this?)

This kit includes everything you need to hook up two amps but it doesn't include
another piece of wiring for the capacitor as well as a third set of RCA's if you are
running head unit with three sets of pre-outs. Anyway, this unit is awesome
because you won't be running back and forth to the store cause it has everything
you need for wire runs as well as hooking up both your amps. Awesome!!!!

Great value

Written By Alistair, Dallas, TX on Wednesday, June 24, 2009

Crutchfield Customer Review (What's this?)

Great bundle, certainly cheaper than buy items separately. I did need extra speaker wiring which was ok. Cables are great quality and the package is really heavy i.e. lots of copper!

Convient dual amp power solution!

Written By Phil, Newport, VT on Monday, February 02, 2009

Crutchfield Customer Review (What's this?)

I checked out the other wiring kits for single and dual amps, and this kit by far had the most for your money! I used this to power both my speaker and sub amps. If you are looking to power 2 amps this kit is a no brainer.

Rockford Fosgate RFK4D

Written By GSC, Milwaukee, WI on Saturday, November 15, 2008

Crutchfield Customer Review (What's this?)

This is an excellent kit. Wire and distribution blocks are very high quality. If you're putting in a new amp, main speakers, and a sub as I did, this has everything you'll need to do the install. The speaker wire included in the kit is only single insullated 16 guage though... You might want to buy better, double shielded speaker wire.

ROCKFORD FOSGATE

Written By Lisa, Osceola, WI on Monday, November 10, 2008

Crutchfield Customer Review (What's this?)

Rockford Fosgate is most definately the way to go. This kit has everything you need. Everything i have ever owned that has been Rockford Fosgate I have never had any problems with. The only way to go is Rockford Fosgate.

Rockford Fosgate RFK4D

Written By ben, Lancaster, CA on Monday, October 20, 2008

I purchased this kit after having previous experience with the Streetwires
kit. I must say that this is a good kit for the price. It came with two sets of
patch cables and 30 feet of 16-gauge speaker wire. However, you would
need another set of patch cable if you were running a 4-channel amp or a
few 1M/2F adapters. Also, I really didn't care for the Maxi fuse because it
was not fully enclosed from the elements. So I switched to the AGU fuse
and fuse holder to prevent water damage. Overall, it is a good product.

Rockford Fosgate RFK4D

Written By metalsatyre, fort Worth, TX on Tuesday, September 16, 2008

Crutchfield Customer Review (What's this?)

Excellent kit. Every thing all in one. Worked well in my wrangler; wired up a RF 2-channel and a Kenwood 4-channel.

Superb kit for dual amp wiring

Written By drmstlr, Little Elm, TX on Saturday, July 12, 2008

Crutchfield Customer Review (What's this?)

This kit has everything you will need to wire up two or more amps, depending on their location.

I used if to wire 2 1000W amps mounted on the back of the rear seats and had wire left over. The speaker wire was a little less than what I needed, but that was only one piece of the whole kit.

My only complaint, and the reason I gave 4 stars instead of 5, there are no screws to mount the distribution blocks with.

Rockford Fosgate RFK4D

Written By Anonymous, Alburtis, PA on Thursday, May 01, 2008

Crutchfield Customer Review (What's this?)

This kit had everything needed for my dual amp install. No issues at all. Wire is of stated gauge. Be careful when buying some cheaper off brands as their wire is not always of their stated gauge. I would definitely buy this kit again.

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Rockford Fosgate RFFM100 MAXI Fuse

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Questions & Answers Ask the community. Share your knowledge.

1 question already asked

Kit will work for that. double check the required cable lengths [ JASON  Feb 20, 2014 ]
Absolutely. Crutchfield has thought of everything you may want to use in hooking up whatever system you choose, in any configuration. They have yet to miss anticipating the remotest need I may have in numerous setups over the years, and for a number of different vehicles. [ DOUG  Feb 20, 2014 ]
You need additional patch cord to run 4 channel amp [ CHRIS  Feb 19, 2014 ]
Yes it does. I used it for a 4 channel amp and a mono amp for a sub. It's a great kit, but I had to buy an extra roll of speaker wire to run since I was running a 4 channel amp. That would be my only complaint, because otherwise it's a great kit. You may not have to depending on your car make and the distance between the speakers and the amps. [ KEVIN  Feb 19, 2014 ]

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