Rockford Fosgate RFK4I

4 Gauge 100% Pure Crystal-Oxygen Free Copper 2-Channel Amplifier Wiring Kit

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• 4 Gauge Power and Signal Installation Kit
• 100% Pure Crystal-Oxygen Free Copper (PC-OFC)
• FULL Spec Cable Meets or Exceeds AWG (American Wire Gauge) Requirements
• Includes Appropriate Wire Termination Hardware

Learn more about the rfk4i
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Product Highlights

• 4 Gauge Power and Signal Installation Kit
• 100% Pure Crystal-Oxygen Free Copper (PC-OFC)
• FULL Spec Cable Meets or Exceeds AWG (American Wire Gauge) Requirements
• Includes Appropriate Wire Termination Hardware


Rockford Fosgate

Authorized dealer

Rockford Fosgate Premium Wire

General Features:

  • 4 Gauge Power and Signal Installation Kit
  • Designed specifically for car audio systems up to 1200 watts
  • Premium power and ground wire provides optimal power transfer
  • Made from 100% oxygen-free copper for a pure uninterrupted transfer of power
  • Includes 2-channel RCA interconnect cables for the audio signal connection from the receiver to the amplifier
  • RCA Interconnects are made with twisted-pair technology for noise reduction
  • Terminals are nickel-plated for excellent signal transfer
  • Maxi Fuse holder offers ideal protection for high powered systems
  • True-to-Gauge cables/wires meet or exceed the industry standard of copper required for the gauge size
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Package Includes:

  1. 17ft. 4-Gauge power cable
  2. 3ft. 4-Gauge ground wire
  3. 20ft. Twisted pair of RCA
  4. Maxi fuse holder and fuse
  5. 20ft. Remote wire
  6. 100 Amp fuse
  7. Cable Ties
  8. Butt connectors
  9. Spade Terminals
  10. Firewall Grommet

Check out the Rockford Fosgate RFK4I Owner's Manual

Specifications & Details

Amplifier Kit Specifications
Amp Kit Type
Number of Amplifiers Supported
Maximum Recommended Power Handling
Power/Ground Wire Size
4 gauge
Power Wire Length
17 feet
Power Wire Color
Ground Wire Length
3 feet
Ground Wire Color
Speaker Wire Included
Speaker Wire Gauge
Speaker Wire Color
Remote Wire Gauge
Remote Wire Length
20 feet
Interconnect (RCA) Signal Cables Included
2 Channel
RCA Cable Length
Fuse Holder
Fuse Size
Distribution Block Included
Complies to AWG Standards
Wire Material
OFC (100% Oxygen-Free Copper)
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details


Model Number:




Internal SKU:


Internal Product ID:


Product and How-to Videos

  • 3Sixty3 Aftermarket Setup Wizard Tutorial
  • Why Should I Buy Oxygen Free Copper (OFC) Cable? | Car Audio Speaker and Amplifier Power Wiring

Customer Ratings & Reviews

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I love this wire it's so much better than my old 4 gauge wire. I put it next to the 4 gauge i bought from a local audio store and the rockford wire was twice as big and way more flexible. Everything in this kit is amazing and it is def worth the price.

By turkey on October 2, 2011


found this helpful.

Excellent car audio power cable

Excellent product. Easy to work with. I bought two sets so I could wire a four channel amp and have extra power wire to do a "big three" wire project under the hood. Highly recommended.

By Greg on December 29, 2012


found this helpful.

Rockford Fosgate RFK4I Review

All i can say is wow. Unbelievable power delivery and a crisp clean signal with no distortion or signal loss issues. RF has always been amazing with their products and this kit just adds to that reputation.

By Nuremberg on September 20, 2012


found this helpful.

amp install kit

very nice kit for the price paid. wire is extremely flexible for gauge. power wire is long enough to go from battery at the front of the engine bay, through the firewall, under dash, under the carpet, down transmission tunnel, under rear seats, into trunk and still have 2 feet to spare. this was done on a 93 chevy beretta, so bigger sedans and suvs may need more wire. i'm very pleased with this kit and would buy again

By Alex on April 20, 2011


found this helpful.

Excellent qaulity.

Excellent product. Great build quality. True to Gauge. NO B.S. specs. The fuse holder is a little tricky.

By Exavier on June 12, 2012


found this helpful.

Good Wires

Good wires, i like them. They do a good job. They are a lot of money but you get what you paid for, cant go wrong with Rockford products.

By Jim on April 2, 2012


found this helpful.

Good Deal!

Good quality at a good price, shipping was good and quick as well.

By Rob on February 9, 2012


found this helpful.


Great Great Deal! RF's Cables are nice!

Really Flexible
HIGH HIGH QUALITY CABLES (i was surprised.)
It looks like licorice. (seriously!) :)
Pre-Attached Fuse Holder and Terminals

A different fuseholder would be nice because it just sticks out and was more of a hassle to try and get it in.

By Ryan on May 24, 2011


found this helpful.

amazing amp kit

really flexible and bendy and performs much better than anything else

By piyush on April 30, 2014


found this helpful.


like most said the fuse holder was awkward and a little tricky.. but besides that everything is great!

By Jace on March 27, 2012


found this helpful.


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