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Old 03-22-2016, 04:51 PM
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ground loop/alt whine after lc6i

So i got my stereo installed. Factory hu with lc6i for 4 channels amp. Well when i rev i have a slight ground loop noise. Almost like alt whine.

The lc6i supposedly has an internal noise filter.


What should i do to get rid of this? The lc6i isnt even turned up very high

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Old 04-02-2016, 10:32 PM
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Re: ground loop/alt whine after lc6i

wow not 1 reply?
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Old 04-05-2016, 06:17 AM
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Re: ground loop/alt whine after lc6i

In order for members to respond, you need to provide more information. The most important would be the year of your truck, and the head unit info.

who did the installation?
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Old 04-05-2016, 08:11 PM
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Re: ground loop/alt whine after lc6i

Where is the Audiocontrol grounded? Did you install it yourself or have a shop do it?
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Old 04-06-2016, 06:45 PM
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ground loop/alt whine after lc6i

Check the location of the ground. Make sure it's tight and making good clean contact to bare metal. If it were my jeep id run a single 4 gauge ground wire directly from the battery into a distribution block to ground anything your installing that's aftermarket.

If not, you can always just use an existing bolt (seat belt, seat, etc..) Basically any point that is connected to the frame.


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Old 04-07-2016, 02:55 PM
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Re: ground loop/alt whine after lc6i

Quote:
Originally Posted by antsjeep View Post
Check the location of the ground. Make sure it's tight and making good clean contact to bare metal. If it were my jeep id run a single 4 gauge ground wire directly from the battery into a distribution block to ground anything your installing that's aftermarket.

If not, you can always just use an existing bolt (seat belt, seat, etc..) Basically any point that is connected to the frame.


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Both power leads can pick up either radiated or conducted noise.
Radiated would come from running a long +12 or ground too near a noise source.
Conducted from picking a poor power or ground tap.

Most modern alternators aren't that noisy, but you'd need an o-scope to check them as if the cables to the battery and frame are well cleaned and tight, that tends to cut engine speed related noise.

If you had a shop install this, pay them a nice visit, as although your unit may have an internal filter, they should have equipment to tell if the noise is coming from the power/ground feed or is being radiated into the unit.

Conducted noise is trivial to get rid of, usually with a capacitor pair where the two are wired in parallel with a small higher frequency one and a slightly larger lower frequency one. Adding inductors should be avoided if possible as they can limit power.

Radiated noise is also easy as copper mesh is cheap, but making sure it covers the issue isn't for amateurs.
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Old 04-07-2016, 05:03 PM
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Re: ground loop/alt whine after lc6i

thanks for the responses guys. I will try to change the ground. He said it grounded to frame but im gonna grouund it to where the battery in grounded and ill check back.
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Old 04-07-2016, 05:43 PM
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Re: ground loop/alt whine after lc6i

Give this a read. It is a bit on the basic side, but may help.
Caution on grounds that it is a black art in noise suppression.
It may work better if grounded very near the radio to a good bare metal ground, or it may work better if grounded at the battery.

I'll assume that the noise is alternator whine where you can ignore the RF dictum that a ground longer than it is wide is not a ground--it is an antenna.

If all else fails, if you can get at the antenna input, unplug it and see if that kills the noise. Then you can decide whether to drop a noise filter into the power lead or the antenna feed. I'd be careful about the latter, since I haven't really played with this crap since the days of satellite feeds. If you do use a power line filter, make sure it can handle the power... cheap ones don't, and can be noise sources themselves.

A polystyrene type cap in parallel with a small disc ceramic wired right at the radio from power to ground often works better than many commercial filters.
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