BestCarAudio.com

Showcasing the Best in the Mobile Enhancement Industry

Showcasing the Best in the Mobile Enhancement Industry
  • Upgrades
    • Motorcycle Audio
  • Articles
    • Bluetooth
    • Car Audio
    • Motorcycle Audio
    • Navigation
    • Remote Starter
    • Satellite Radio
    • Smartphone Integration
    • Test Drive Product Reviews
    • Vehicle Insights
  • Profiles
    • Installation Profiles
    • Installer Profiles
    • Retailer Profiles
    • Vendor Profiles
  • Products
  • Dealer Locator
  • Contact
  • Shop
  • Facebook
  • Twitter
  • Instagram
  • 0 items
Home » ARTICLES » Let’s Talk About Car Audio Wire Size
Sony Ad

Let’s Talk About Car Audio Wire Size

March 27, 2020 By 1sixty8 media

Wire Size

Specialty mobile enhancement installation technicians couldn’t upgrade the audio systems in our cars and trucks if they didn’t have access to high-quality, correctly sized wiring. Whether they are connecting a pair of speakers to a radio or running large power and ground wires from a battery to an amplifier, wiring and its size is crucial. There are a lot of myths and misunderstandings when it comes to wiring. Let’s break down a few and look at the truth.

For this article, we are going to talk exclusively about all-copper conductors. The alternative to copper is copper-clad aluminum (CCA). Aluminum adds unwanted resistance and reduces the power delivery efficiency of our audio systems. Pound for pound, aluminum is 61% as conductive as copper. One of the most significant issues with CCA amp kits is that it’s impossible to determine the ratio of copper to aluminum. In most cases, the size of the wire does not meet the American Wire Gauge standard.

Myth #1: If it’s not CCA, it’s OFC.

As with any industry, people like to throw buzzwords around. One that gets sprinkled around liberally is the acronym OFC, which stands for oxygen-free copper. Oxygen is a critical component in the smelting of copper. Oxygen is injected into the molten mixture that helps extract impurities that would degrade the resulting product.

High-conductivity copper does exist. Compared to the International Annealed Copper Standard (created in 1913), many modern, low-impurity coppers can achieve conductivity that reaches 101%. The standard, for those who are interested, is 0.15292 ohm for a copper mass of 1 gram with a uniform cross-section and a length of 1 meter.

Specifically, stating that a copper conductor is oxygen-free doesn’t mean that it’s pure or offers exceptional electrical conductance. In most instances, OFC car audio wiring is simply an alternative to copper-clad aluminum solutions. Much of it is made from recycled copper and contains other metals like tin.

Interestingly, the CEA-2015 standard for car audio conductors specifies a maximum resistance of only 93.15% of the IACS standard.

Wire Size
You can usually discern copper vs. copper-clad aluminum by looking at the end of the cable. The CCA will show lots of aluminum on the end.

Myth #2: Your Small Speakers Need Big Wire

Initially established in 1857, the American Wire Gauge standard was created to identify the size of solid electrical conductors and, consequently, their ability to pass current without significant voltage loss. The gauge system is based on the number of draws of a conductor through a die, with more draws (higher gauge number) resulting in a smaller-diameter wire. The standard for standard wires is different than for that of solid wire.

As we discussed in our article about speaker power handling, most midrange speakers and tweeters receive only a few watts of power, even at high volume levels. If we use the example of a tweeter and make the assumption we are going to drive it incredibly hard with, say, 10 watts of power, we only need to deliver 1.5 amps of current during the highest peaks in our music.

Since all conductors add resistance to a circuit, they should be sized to provide an acceptable amount of signal loss for a given distance. The CTA-2015 Mobile Electronics Cabling Standard notes that a 20-AWG cable with a length of 21 feet will deliver 80 watts of power with less than a 1 dB drop in output. This does take into account the total length of both conductors in a cable.

Wire Size
A tweeter like the ARC Audio RS 1.0 doesn’t need massive speaker cable to deliver impressive performance.

Myth #3: Amp Kits Should Have Power Ratings

Decades ago, Phoenix Gold (and many other companies) published charts that outlined power wire sizes based on amplifier power ratings. As a general rule of thumb, these were helpful. However, without specifics about allowable voltage losses between the battery and alternator, and the amplifier, the numbers are somewhat meaningless.

We’ll look at a brand-name amplifier installation kit that includes what they describe as full-AWG spec 4-gauge pure copper power wire in a length of 18 feet. The kit is rated for 175 amps of current and is said to be compatible with a 1750-watt amplifier.

Assuming it complies with the CTA-2015 standard, the power wire will have a maximum resistance of 28.346 milliohms per foot, for a total of 5.102 milliohms for the length of the cable. If we pass 175 amps of current through that cable, we get a voltage drop of 0.89 volt.

The CTA spec for acceptable voltage drop is 0.25 volt. As such, a high-quality 4-AWG power kit would have a maximum power rating of about 50 amps for an 18-foot length. Keep in mind, this only takes into consideration the positive conductor. Your ground cable and the resistance of the vehicle chassis also need to be taken into account. In short, you are likely running too small of a power cable.

Wire Size
Buyer beware! A 4-gauge CCA amplifier installation kit rated for 2,800 watts? This isn’t going to deliver power very efficiently.

Get the Right Size Wire for Your Car Audio System

When it comes to power delivery to your amplifiers, bigger cables are always better. When it comes to running speaker wire to your mids and tweeters, you don’t need 12-AWG. If you are planning on having your car stereo upgraded, visit your local specialty mobile enhancement retailer and ask them about the size of power and speaker wires they will be using in your installation.

Share this:

  • Tweet
  • Email

Related

Filed Under: ARTICLES, Car Audio, Resource Library Tagged With: Amplifiers, CCA, CTA-2015, CTA-2015 Mobile Electronics Cabling Standard, OFC, Phoenix Gold, Power Wire, Speakers, Wiring

About 1sixty8 media

1sixty8 media is a content marketing, website development, and business solutions provider specializing in the mobile enhancement industry. The 1sixty8 media team includes many household names in the industry, from store owners and industry writers to award-winning installers and fabricators. To learn more about 1sixty8 media, visit www.1sixty8.com.

Audison Forza

Save Time and Money!

Our buying guides will help you make educated decisions when upgrading your vehicle. Click the image above to shop our affordable and informative buying guides.

Industry Profiles

Sony Prize

Industry Profile: Sony 12 Days of Christmas Grand Prize Winner

May 30, 2023 By Dave MacKinnon 

In December 2022, BestCarAudio.com and Sony launched a giveaway contest called the Sony 12 Days of Christmas. For 12 … [Read More...]

Hilux Stereo

Mobile Enhancement Installation Profile: Xtreme Autosound & Marine Toyota Hilux

March 15, 2023 By Dave MacKinnon 

Matthew Crouch of Shelbyville, Kentucky, owns the ultra-clean 1991 Toyota Hilux you see above. Matthew is one of the … [Read More...]

Press Releases

Sony XAV-9000ES
Sony Electronics Introduces New Mobile ES Car AV Receiver and Power Amplifiers
RDVFL Mighty Mount Press Release
RDV Becomes Exclusive US Distributor for Mighty Mount
New Heise Connect App Goes Live for Smart Devices
RDVFL CarPlay CP1
RDV Releases New CarPlay Hardware Platform
Maserati Radio
RDV Launches Tesla Style Radio for Maserati

Vehicle Insights

2023 Lexus ES300h F Sport

2023 Lexus ES300h F Sport. Smooth with a Touch of Sport.

2023 Mazda CX-9

2023 Mazda CX-9. Leaving Smoothly.

Find Facility Near You

Subscribe to BestCarAudio via Email

Enter your email address to subscribe to BestCarAudio.com and receive notifications of new posts by email.

Popular Categories

  • Car Audio
  • Window Tint
  • Remote Car Starters
  • Vehicle Insights
  • Radar Detectors

Supporting Manufacturers

  • Arc Audio
  • Compustar
  • Hertz
  • Momento
  • Rockford Fosgate
  • Sony

Contact

  • Editorial
  • General
  • Advertise
  • Dealer Locator Guidelines

Miscellaneous

  • Profile Request
  • Press Release Guidelines

Sign up for our newsletter today. Opt out at any time with 1 click.

  • This field is for validation purposes and should be left unchanged.

BestCarAudio.com is a product of 1sixty8 media, inc. · Copyright © 2023 1sixty8 media, inc. · Privacy Policy · Website by 1sixty8 media, inc. · Log in

 

Loading Comments...
 

    x
    x