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If a whining noise from your car stereo has you covering your ears, a ground loop may be to blame. It’s impossible to say for sure without looking at your specific car audio setup, but your audio system may be suffering from a classic ground loop problem. Ground loops occur when two components are grounded in locations with different ground potentials. That can create an unwanted current, which introduces the sort of interference that is often described as a hum or a whine.

1. Cable Ground Loop Isolator

Smof Ground Loop Noise Isolator for Car Audio/Home Stereo System (Eliminate The Buzzing Noise Completely) with 3.5mm Audio Cable, Black. 3.9 out of 5 stars 570. Noise isolator $8.99 $ 8. Get it as soon as Mon, Sep 9. FREE Shipping on orders over $25 shipped by Amazon. Ground loop isolators are used in a variety of electrical systems, especially in audio/video devices. Most speaker systems use a ground loop circuit to connect two or more speakers together and the voltage difference between them is often responsible for an audible hum heard over the audio.

The right way to fix a car audio ground loop problem is to ground everything in the same place. If you can't fix the problem the right way, the solution is to use an in-line noise filter.

• But audio systems are just like any other electrical system, and a lot can go wrong in the details. Once of them is the nefarious 'ground loop,' which is a phenomena that induces a maddening hum in the speakers. A 'ground loop isolator' is a good temporary fix, but this might be a good time to talk to a pro about finding a more permanent solution.
• While the right way to fix a ground loop is to deal head-on with the differential in ground potentials between different components, it’s not the only way. If the thought of tearing down your audio system, locating the grounds, and then putting everything back together doesn’t sound appealing, then you might want to look into an isolator.
• May 16, 2017  Ground loop audio noise is something that every audio engineer experiences at some point in his working life. A combination of cabling, equipment interaction, and environmental conditions (temp, humidity etc) can cause ground loops to occur in one scenario but not another. Ground loops can happen when multiple devices are connected to a common ground.

Car Audio Ground Loops

Although there are a lot of things that can introduce unwanted noise in a car audio system, ground loops are the single biggest culprit. This noise problem can occur at any time two audio components in the same system are grounded in different locations. If those two locations have different ground potentials, an unwanted current flow, which can create noise, is introduced into the system. When the difference in ground potentials is removed, the unwanted current flow ceases, and the noise goes away.

In-home audio systems, ground loops usually happen when two components are plugged into different outlets. Fixing the problem may be a simple matter of changing where you have things plugged in. Unfortunately, the matter of grounding is a little more complicated in-car audio systems. The chassis — and any metal that’s in contact with it — is the ground, but not all grounds are created equal. For example, grounding one audio component to the chassis and one to the cigarette lighter is a classic situation that can lead to the creation of a ground loop. Grounding a head unit to a cigarette lighter instead of the chassis also can introduce a ground loop.

The right way to fix the problem is to tear down your sound system and attach the grounds from components like the head unit and amp directly to the chassis in the same place. That’s why it’s so important to make sure that everything is carefully plotted out during the planning stage of any new car audio system and then hooked up correctly during installation. This is a situation where an ounce of prevention is worth a pound of cure.

Isolating Ground Loops

While the right way to fix a ground loop is to deal head-on with the differential in ground potentials between different components, it’s not the only way. If the thought of tearing down your audio system, locating the grounds, and then putting everything back together doesn’t sound appealing, then you might want to look into an isolator.

Ground loop isolators consist of an input, an output, and a transformer. The audio signal enters the isolator through the input jack, passes through the transformer, and exits through the output plug. Since there is no direct electrical connection between the input and output, the ground loop and any interference it generates is isolated from the signal.

Cable Ground Loop Isolator

While these noise filters are technically just patches, and your underlying problem still exists, they’re patches that solve the immediate problem.

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