Ground Loop
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=74869
Printed Date: November 03, 2025 at 10:44 PM
Topic: Ground Loop
Posted By: smokinsmitty
Subject: Ground Loop
Date Posted: March 21, 2006 at 5:30 PM
Ok I seen where Fusion makes this thing to eliminate the Gound Loop noise! Does it work? anyone used it?
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1 15" Memphis Mojo,
Memphis 16-mc1000D amp,
Audiopipe 4gauge mp kit, Pioneer DEH4700MP head unit.
2002 Yamaha 660R Raptor
Yamaha FZR600 crotch rocket
Sea Doo XP800
Sea Doo Spi
Replies:
Posted By: xscash
Date Posted: March 21, 2006 at 6:49 PM
alot of manufactures make ground loop isolators....and yes for the most part they do help and in most cases eliminate a ton of engine noise. other alternatives are grounding the radio at the amp or using a 50,000 micofarad cap on the alternator....but the easyiest is your choice. XS
Posted By: coppellstereo
Date Posted: March 22, 2006 at 10:38 PM
can anyone define ground loop, and ground loop isolator for me?
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Posted By: placid warrior
Date Posted: March 22, 2006 at 11:59 PM
not 100% positive but i believe a ground loop is when u have multiple different grounding points for your stereo stuff which have different resistances and causes noise to be introduced because of those resistance differences...not sure on the isolator but it looks like a filtering cap or something...Cant ground loops be fixed by making sure your ground from your battery is good with the body, and chassis as well as keeping grounding points to a minimum.
Posted By: kgerry
Date Posted: March 23, 2006 at 2:43 PM
it's just a coil that inducts the audio ground path between two points....
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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: forbidden
Date Posted: March 23, 2006 at 4:17 PM
And is generally referred to as a band aid. It does not solve the root cause of the problem but does indeed aid it.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: electrostatic
Date Posted: March 23, 2006 at 5:17 PM
Posted By: electrostatic
Date Posted: March 23, 2006 at 5:54 PM
ground loops are created when electronics have poor isolation between their signal ground and power ground. in the above pic assume circuit 1 to be a headunit and circuit 2 to be an amp. they both have poor isolation between their power ground and signal ground, they are tied together. the +12 power wire for both circuits was left out. because of the resistance between the power grounds a noise voltage develops causing a noise current to flow thru the signal ground. this is one reason its advisable to have a single ground point for your audio components, less resistance = less noise voltage. anyways, hope that helps.
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