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NVX Big 3 Package

Big 3 Upgrade Combo Package 1/0 AWG EnvyFlex Cable, Wire Cutters, 2 Battery and 4 Ring Terminals

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List price $277.90

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Sonic Exclusive Big 3 Upgrade Combo Package

The Big 3 Upgrade should be the first step you take when adding an aftermarket sound system to your vehicle. The Big 3 consist of upgrading the alternator wire to the battery, the negative battery cable to vehicle ground, and engine ground to chassis. This process is sure to help eliminate dimming headlights and voltage drops by providing you with enough juice to power everything in your vehicle without additional resistance. 1/0 Gauge power & ground wire should be used when executing the upgrade, the thicker wire ensures the best possible current transfer and can re-energize your vehicle's electrical system.

Available only at Sonic Electronix is the Ultimate Big 3 Upgrade Kit. This exclusive Big 3 combo package comes with two 5 ft. pieces of 1/0 AWG Metallic Gray Power/Ground Cable, one 5 ft. piece of 1/0 AWG Metallic Powder Blue Power/Ground Cable, two Positive/Negative Battery Terminal Clamps, four 0/2 Gauge Ring Terminals, and a pair of Wire & Cable Cutters to add some convenience to this upgrade.

Benefits of Big 3 Upgrade

  • Helps eliminate dimming headlights
  • Helps stop drops in voltage
  • Enhances your vehicles electrical system stability
  • Allows you to add a second battery or high output capacitor for high powered sound systems
  • Improves vehicles system charging
  • Increases compatibility when using high performance alternators and batteries
  • Strengthens power current to everything in your vehicle without additional resistance
Note: For information on installing this Big 3 Upgrade kit, please read our blog and watch the step by step installation video.

Power / Ground Cable Specifications

Wire / Cable Type
Wires and cables are made for different uses. This use that the wire or cable is made for.

Please make sure that the wire you are purchasing matches the intended use.

Power / Ground Cable
This the how long the item is. When purchasing an item that requires a specific length (such as RCA interconnect cables or speaker wire), please make sure that the length of the item is long enough for your needs.
15 feet
Wire Gauge
The measurement of the diameter of wire. As the gauge number increases the size of the wire decreases. As the wire gauge number decreases, the diameter of the wire increases. For example, an 8 gauge wire is going to be larger than a 16 gauge wire.

When purchasing wire, make sure that you know what size, or gauge of wire is needed.

0 gauge
Primary Color
This is the main color of the item.
Matte Grey
Complies to AWG Standards
Since 1857, The AWG (American Wire Gauge) system has been the standard for measuring the diameter of wire. AWG standard is the measure of bare wire to find true gauge. Companies that do not follow AWG Standards include the thickness of the wire jacket which means the actual wire is not "True to Gauge".
Wire Material
The material that the wire is made of. Copper & aluminum are the most commonly used materials. OFC - Oxygen Free Copper is the ideal choice for wire material. Copper is a superior electrical conductor, & does not expand or contract with heat. CCA - Copper-Clad Aluminum is a suitable choice for lower powered or budget applications. The power transfer is not on par with OFC, but this material offers significant savings.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating



Verified Purchase

April 27, 2015

The wire on this kit is insanely thick. Great quality. The wire cutters are great for cutting and stripping and the terminals make the installation look great. The ring terminals may cause issue depending on where you're placing them. They were too thick to fit on my alternator but a little time with a metal grinder fixed that. Great kit!

15 of 29 found this helpful

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Enterprise, Al

Great Product

October 26, 2013

Have not actually owned or used this particular product, but i have used and seen nvx wire. great wire. the only issue that i see with this is that you made need additional ring terminals depending on your application, and if you don't have a fuse block for your alternator charge wire that can be modified for this upgrade, you will have to purchase one extra. Other than that, great product

42 of 91 found this helpful

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Browse 2 questions and 5 answers
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Why did you choose this?
Sonic Electronix Store
Had what I needed bonus wire cutter, my only opinion on a downside would be the power being blue instead of red
Eric W on Apr 20, 2015
Upon extended research of other brands, this kit beats the competition. Quality, true to spec wire, top notch terminals, and even wire cutters. You can't go wrong.
Corey M on Jan 8, 2015
nvx products are truly great quality and sonic electronix give great service to us consumers. thank you sonic electronix
Kyle H on Feb 2, 2015
I have a MTP-65 battery and a mechman 370A alternator I want to know which big3 kit to get?
Jack W on Mar 6, 2015
Best Answer: I would get the 1/0 wire, works good for me. Go big or go home.
Reply · Report · Leon K on Mar 10, 2015
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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: NVX Big 3 Package