Rockford Fosgate RFK4X

Complete 4-gauge amplifier wiring kit
Includes patch cable and speaker wire

Item #: 575RFK4X

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15 Reviews

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This wiring kit includes patch cables and speaker wire for a 2-channel or mono amp — you'll need to add cables and speaker wire for multi-channel amps

Your amp needs high quality wiring in order to deliver top performance to your sound system. Rockford Fosgate's RFK4X amplifier wiring kit supplies everything you'll need to send power and signal to your amplifier and speakers, including power cable, patch cable, and speaker wire.

It's designed for amplifiers with fuse ratings of up to 100 amperes. Rockford Fosgate makes these cables from 100% pure crystal-oxygen free copper wire so you can count on maximum signal transfer.

Product Highlights:

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

Rockford Fosgate RFK4X Reviews

Average Customer Review:

15 reviews
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Good Quality

Written By Jukebox, Scott La on Friday, June 19, 2015

Crutchfield Customer Review (What's this?)

Solid lil wiring kit not too pricy and just what I needed.

Pros: High grade wire and the fuse block was of good construction.

Cons: I would like to see different grounding options included with these kits. Like the terminals that have three holes to get a better ground when you can't get to a bolt location.

decent enough

Written By Spud, Volcano, HI on Monday, March 23, 2015

Crutchfield Customer Review (What's this?)

not bad. everything u need. good quality wire as well. little pricey, but works well. dont get voltage drop or amperage loss at end of 17' run.

Pros: good main wire, good speaker wire, good rca cables

Cons: maxi fuse.... not water tight casing...... make sure its in a good dry spot...... connectors not soldered only crimped. for the price, they could have upped the 'perfectionism' of it. fosgate claims top of the line.... so prove it


Written By PERFECT FOR SELF INSTALL, SANTA ROSA, CA on Tuesday, January 27, 2015

Crutchfield Customer Review (What's this?)


Wiring Harness

Written By Terry, Corbin, KY on Thursday, July 10, 2014

Crutchfield Customer Review (What's this?)

Super quality you get what you pay for.

Pros: Everything they claim

Cons: None

Wiring Harness

Written By Anonymous, Vallejo California on Saturday, June 14, 2014

Crutchfield Customer Review (What's this?)

Everything I needed was in the package. Crutchfield takes all the thinking out of the process with the research they put into the product line for you.

Just what I expected.

Written By Dan C., Cbus, Ohio on Tuesday, May 13, 2014

Crutchfield Customer Review (What's this?)

good set of high quality well insulated cables that when bought with my amp were 50% off just what I expected plus gets you a second year of warranty when used with your Fosgate amp so doubly sweet.

Pros: extra year of warranty and just what you need to install no extra bits needed

Cons: none that I can find other than extremely small terminal connecters on ground cable made it really had to find an actually bolt to fit it in my truck the connector was about a 10mm hole and the safety harness and bolt to my seats (only bolts near unit) are at least 14 mm so would like to see the preinstalled terminal connectors in a bigger size

Connects right to the battery without anything additional needed

Written By Peczenij, Bethlehem, PA on Thursday, December 19, 2013

Crutchfield Customer Review (What's this?)

Fine product. Speaker wire is only 16 gauge however - I would have preferred larger wire.

Pros: Connects to battery easily without needing anything else.

Cons: Fuse holder a bit confusing at first

RFK4X Amp Wiring Kit

Written By Britt C, Richmond, VA on Sunday, September 22, 2013

I have always trusted the Rockford Fosgate brand. You usually get higher quality products at a reasonable price. But I was disappointed when I opened the kit. The fuse holder was awkward to use, the RCA cables were low quality and the crimp connectors were junk! The only positive was the power cable and ground cable, they were top notch. All parts required for installation were there and my install went just fine but for the money I expected more.

Pros: Power and ground cables were high quality.

Cons: Crimp connectors, RCA cables and fuse holder were of lesser quality.

Amp Kit

Written By Eddie, Knoxville, IA on Tuesday, April 09, 2013

Crutchfield Customer Review (What's this?)

Have everything you need to install the amp. What else can I say.

Pros: Everything as advertised.

Cons: none

Rockford Amp wireing kit

Written By Cobster, Sargent, Ne on Wednesday, February 13, 2013

Everything is good but the RCA cables are cheaply made compaired to the rest of of the kit.

Pros: Cabels are 100% copper and super flexable

Cons: RCA cables are cheaply made

Great kit

Written By DDC, Gallup, NM on Monday, September 24, 2012

Crutchfield Customer Review (What's this?)

All I needed to hook up my system. High quality wiring and works perfectly with the equipment I chose.

ticked off

Written By Anonymous, Chicago Illinois on Thursday, June 14, 2012

Crutchfield Customer Review (What's this?)

put everything in found out the patch cables or RCA cables we're defective

Pros: everything was great except for the patch cables

Cons: kind of expensive and my cables did not work should've tried another brand

Great kit, not so great price.

Written By Garrett, OKC, OK on Wednesday, March 18, 2009


True AWG wire.

High strand count <---That's a good thing.

EXTREMELY flexible. You can pretty much tie this in a knot without worry of breaks, which makes it your best friend for complicated and cramped installs.

The kit is complete with everything you need. More than you need actually!

Cons: It's possible you will have to drill out or notch the power ring connector, but this is not difficult with a sharp drill bit or other "correct" tools. The connector is high quality however, so I guess that's a plus.

Price. Even for such a great product, that's a steep one.

REMEMBER: Be safe, don't mess with live wires!

Good kit

Written By slvbeard, Central, MD on Friday, September 05, 2008

Good kit for the money, flexible thick wire. Works well.


Written By GrandAm84, Wisconsin on Sunday, January 13, 2008

To start out i have 2 12" Rockfords with a amp. Before this kit everything was working fine but i hooked this up and nothing happend. i double checked everything and still dont know what i did wrong. Also the power cable end didnt fit the battery to good so i had to re drill that to. Overall pretty bad for what i was expecting from Rockford which has always been good to me

Hands-on research

What's in the box?

Download owner's manual

  • One 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)
  • 100A MAXI fuse
  • 3' Ground cable (4-gauge) in a translucent gray jacket (with a ring terminal on one end)
  • 16' Twisted pair RCA patch cord
  • 30' of 16-AWG speaker wire
  • 20' Turn-on lead in a blue jacket
  • Ten 4" wire ties
  • 1 Plastic grommet
  • 5 Plastic butt connectors
  • 6 Female quick slide connectors
  • 5 Male quick slide connectors
  • Eight 16-AWG Spade connectors
  • 4 Blue rubber boots
  • 4 Black rubber boots

Product Research


General Overview: This is a single amplifier wiring kit that includes the power and ground cable, turn-on lead, one pair of stereo RCA cables, 30' length of 16-AWG speaker wire and other accessories required to install one amplifier.

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.

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

Patch Cord: Twisted pair cable design is used for noise rejection, a split center pin helps secure the connections at both ends.

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

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.

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Includes patch cable and speaker wire