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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.

Item # 575RFK4X

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$209.99 -$30.45 Outlet savings


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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

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

See the difference between "Open Box" and "Scratch & Dent" Outlet items

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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

7 questions already asked

what is a patch cable? not sure what that means as in relation to a amp wiring kit
[ Corey  Nov 21, 2020 ]
3 answers
When they refer to patch cable , they are referring to the RCA signal cable .
[ Kenneth  Nov 21, 2020 ]
Another word for RCA cables.
[ JO FRANCIS  Nov 21, 2020 ]
Patch cable is the RCA wires that go from the head unit to the amp.
[ ryan  Nov 21, 2020 ]
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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