Humming noise - Alpine HU
Thread Starter
Racer
Joined: Feb 2010
Posts: 416
Likes: 43
Humming noise - Alpine HU
I've got an aftermarket Alpine HU in my C6, and there's a low pitched humming noise that just won't go away. Not even when I turn the HU off. I've been reading and keep running across " ground issue ". I really don't want to have to start taking things apart to get this figured out unless I absolutely have to. Is there something that I can check before having to pull the unit out?
For reference the car is a 2006 C6 Vert
For reference the car is a 2006 C6 Vert
Drifting
Joined: Sep 2009
Posts: 1,305
Likes: 80
From: Hollister CA
If there is any metal on your HU you can get to without pulling it, you can try touching one end of a wire to it, while the other end is touched to the shield part of your 12V power port. If it changes the humming, that would indicate a chassis ground problem.
Typically, humming noises can be caused by poorly shielded or loosely connected audio wires between the HU and the amp or speakers. That would be my first guess.
Typically, humming noises can be caused by poorly shielded or loosely connected audio wires between the HU and the amp or speakers. That would be my first guess.
Last edited by bobeast; Dec 2, 2015 at 11:38 AM.
Thread Starter
Racer
Joined: Feb 2010
Posts: 416
Likes: 43
Melting Slicks
Joined: Oct 2004
Posts: 2,863
Likes: 150
From: Woodland CA
https://en.wikipedia.org/wiki/Ground...electricity%29
Basically, it is a hum that comes out of the car speakers that is a result of a grounding issue. Sometimes the hum will change pitch depending on the RPM of your car. Low hum at idle, higher hum at acceleration.
You can install ground loop isolator that will suppress the humming. You can usually pick one up for about $10-$30.
Basically, it is a hum that comes out of the car speakers that is a result of a grounding issue. Sometimes the hum will change pitch depending on the RPM of your car. Low hum at idle, higher hum at acceleration.
You can install ground loop isolator that will suppress the humming. You can usually pick one up for about $10-$30.
Thread Starter
Racer
Joined: Feb 2010
Posts: 416
Likes: 43
https://en.wikipedia.org/wiki/Ground...electricity%29
Basically, it is a hum that comes out of the car speakers that is a result of a grounding issue. Sometimes the hum will change pitch depending on the RPM of your car. Low hum at idle, higher hum at acceleration.
You can install ground loop isolator that will suppress the humming. You can usually pick one up for about $10-$30.
Basically, it is a hum that comes out of the car speakers that is a result of a grounding issue. Sometimes the hum will change pitch depending on the RPM of your car. Low hum at idle, higher hum at acceleration.
You can install ground loop isolator that will suppress the humming. You can usually pick one up for about $10-$30.
Melting Slicks
Joined: Oct 2004
Posts: 2,863
Likes: 150
From: Woodland CA
Before:
HU ---> RCA lines ---> Amp
After:
HU ---> RCA lines ---> Ground loop isolator ---> Amp
Tech Contributor
Joined: May 2003
Posts: 7,035
Likes: 134
From: North Augusta, SC
Do you have an aftermarket amp and speakers installed?
Is OnStar functional?
Do you know what interface adapter is installed?
It could just be an adjustment on the interface, or the interface itself may be bad.
GLI's may work if you're using the RCA outputs of the HU, but it could be something else.
Is OnStar functional?
Do you know what interface adapter is installed?
It could just be an adjustment on the interface, or the interface itself may be bad.
GLI's may work if you're using the RCA outputs of the HU, but it could be something else.
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