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Rockford Fosgate RFK4X

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

Item # 575RFK4X

Your amp needs high quality wiring in order to deliver top performance to your sound system.

Your amp needs high quality wiring in order to deliver top performance to your sound system.

In stock

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About the Rockford Fosgate RFK4X

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.

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
  • MFR # RFK4X

What's in the box:

  • 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

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More details on the Rockford Fosgate RFK4X

Mark G.
The Rockford Fosgate RFK4X replaces these items:

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.

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Customer Q&A

Crutchfield asked: Why did you buy this?
I have used the brand in the past & they never let me down [ Mario  May 01, 2020 ]
Best brand out here [ Skyler  Oct 11, 2019 ]
good brand, plus had more speaker wire [ Tom  Aug 15, 2019 ]
Rockford Fosgate makes quality stuff so I wanted only the best for my new system I have all the best parts and now soon the best wire to go with it Might as well Why skimp on wiring when spent a fair amount of money on the other parts ( speakers , amp, sub, tweeters)?? [ Catherine  Jan 05, 2019 ]
How can you really go wrong with Fosgate anything!!! This is a product that stands for quality. [ Jesse  Dec 27, 2018 ]
It was recommended for the amp [ MARK W.  Dec 01, 2018 ]
I have a Rockford Fosgate PUNCH Amp that I bought a couple years ago & just now getting around to hooking it up. Crutchfield makes it easy to research what you need from home & pick out exactly the item you need. [ COLBY  Nov 03, 2018 ]
Love all my Rockford Fosgate stuff [ LOGAN  Sep 06, 2018 ]
I picked these items from crutchfield because of good prices and rockford fosgate is the best can't get no better been bumping fosgate since high school . [ Jesica  Apr 25, 2018 ]
Because its Rockford, nuff said [ Devin  Apr 11, 2018 ]
Straight 4 & 4 gauge, long length, The Bigger package was 4&4 and 8&8 if it was 44 and 44 and not shorter length i would have bought that [ Roger  Apr 07, 2018 ]
Most amount of wire per 4gauge wire set. Good reviews online. I trust Rockford fosgate [ mitchell  Feb 24, 2018 ]
The distance from my subwoofer Amp to battery required a 4 gauge wire. [ John  Dec 24, 2017 ]
Great price. High quality wires and fuse holder! Very easy to use for install! And great reviews from other customers [ Justin  Oct 24, 2017 ]
rocky recommended [ michael  Oct 10, 2017 ]
Suggested for amp [ Richard  May 18, 2017 ]
gotta have cable [ jaykub  Mar 12, 2017 ]
sub install [ DALE  Nov 25, 2016 ]
includes additional warranty period with Rockford Fosgate on my amplified [ Carroll Lewis  Nov 15, 2016 ]
4 Guage amp wiring it to get the power I need to where I need it [ Andrew  Nov 14, 2016 ]
Brand name and quality [ Jeremy  Oct 30, 2016 ]
I have used this in previous installs [ shaun  Sep 16, 2016 ]
Too of the line product [ Wanda  Jun 15, 2016 ]
Bought this to run subs in my 05 Cobalt SS [ Ethan  Jun 05, 2016 ]
Trusted brand [ Winston  May 28, 2016 ]
It was the cheapest option that offered a complete amp wiring kit with speaker wires. [ Joseph  May 17, 2016 ]
trusted brand, good reviews, discount pricing [ jay  May 08, 2016 ]
It added a warranty on the equipment. [ Lanell  May 06, 2016 ]
Great products from Rockford Fosgate, used them previously in my G35 coupe using the mutli-channel setup. [ jorey  Apr 16, 2016 ]
Complete package of what you need forthe wiring. [ Ricardo  Mar 28, 2016 ]
i need a wiring kit and trust Rockford above all else! [ CHRISTOPHER  Mar 07, 2016 ]
Good brand [ Douglas  Dec 23, 2015 ]
Good price for all needed items. [ Troy  Dec 16, 2015 ]

5 questions already asked

Will this kit with 100amp fuse work with kicker 1200 watt class d amp? Kicker amp reccomends 150amp fuse so not sure if I can upgrade fuse or if this will work with the 100amp fuse. Thank you.
[ Miguel  Jun 29, 2020 ]
1 answer
It would depend on the length of the wire ran. If there is less than 13 foot of wire to be ran, you could get away with this, but there will be a drop in voltage after that with the 4 gauge wire. I would recommend going to a 2 or 1 gauge wire with a 150 amp fuse. You run the risk of the wire overheating if its undersized.
[ MATT  Jul 03, 2020 ]
I have a hybrid, is it bad to give too much power to the amp for only 1 sub? For instance using a 1000w amp for a 500w rms sub. Would I use this 4g kit or an 8g?
[ Yeti13  May 09, 2020 ]
4 answers
Hybrids do have a limited capacity for their alternator - what is the exact year make and model? You can connect with one of our product advisors to discuss your amp setup and whether your battery/ alternator will be adequate. You can connect with us here:
[ Cosmo  Jun 01, 2020 ]  Staff
I've been building sound systems for over 10 years and I learned one thing very quickly, large amounts of current don't enjoy being pressed thru a small opening. Your amp will only ever draw the current that it needs, however; having a larger power setup will enable it to draw that extra current when needed without issue. I also recommend investing in a top and side post battery. Apply a second ground from the battery directly to the frame of the vehicle. With these things in mind, you should be in good shape.
[ Charles  May 29, 2020 ]
Always bugger wires. As long y You're running under a 1000 RMS most stock alternators most stock alts can only lush like 700 to 1000 watts rms. If you're gonna be over powering the sub I would recommend running sealed or a perfect spec Box And turn the games down slightly from what's recommended
[ Alex  May 29, 2020 ]
You should use the 4g, it will handle the heat and power better.
[ jim  May 28, 2020 ]
Can this support 1300 rms ?
[ Chris  Mar 13, 2020 ]
3 answers
Hi Chris! This 4 gauge wiring kit will be totally fine to use with 1300 watts RMS.
[ Jess  Mar 29, 2020 ]  Staff
yes no problem
[ David  Mar 27, 2020 ]
Yes, this will work just fine .
[ MATTHEW C  Mar 27, 2020 ]
What power can this power cable handle?
[ Peter  Feb 04, 2018 ]
1 answer
If you need help determining the wire gauge you'll need for your amplification, check out our wire gauge chart and formula on the website here: For additional assistance and personalized recommendations, feel free to contact us directly by phone or through our online chat service:
[ Ryan  Feb 12, 2018 ]  Staff
This kit comes with one "set" of RCA cables that would only work for the front/rear speakers. Does a kit come with two RCA cables?
[ Eric  Feb 10, 2016 ]
2 answers
All amp kits, as far as I am aware, only come with a single set of RCA wires. extra pair of RCAs is cheap and Crutchfield will take care of you:-)
[ Barton  Feb 11, 2016 ]
By set it means 2 lines...which is 1 would run either the sub rca input...the left and right of front...or the left and right of rear...if it's a mono channel amp you don't need another cable set...if it's a multi channel amp you will need to by another cables set
[ Homer  Feb 10, 2016 ]

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