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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 03-06-2013, 12:28 AM   #1
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Join Date: Jan 2012
Location: Nashville, Tennessee
Posts: 2,107
My Ride: 2002 330ci
rear speakers buzzing with radio off

the rear sub woofer speakers are buzzing even with the radio off. It is the Harman/Kardon sound system.

I unplugged the rear speaker assembly at the roof of the trunk and the sound went away.

I took the entire assembly apart. I checked to see if the speakers were sealed around the edges. I took apart the sub amp connected to the rear speakers, checked for any cracked solder joints or items that may have vibrated loose. I found nothing wrong with it upon visual inspection.

Ive done a search and while many people have this problem even on the new cars.....it still has yet to be solved.

The only things ive found to be causes for this are cracked solder joints and parts of the sub amp vibrating loose due to not being glued in. Mine is tight and glued in. All the grounds in the trunk are tight and look good with no corrosion.

When i plugged the rear sub woofer speakers back in the noise came back.

Anyone have any other ideas?

Last edited by glhx; 03-06-2013 at 01:34 AM.
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Old 03-06-2013, 04:40 AM   #2
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Join Date: Dec 2011
Location: Brisbane
Posts: 527
My Ride: 2004 325i
The buzzing you are hearing.... Is this alternator whine or something else?
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Old 03-06-2013, 09:29 AM   #3
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Join Date: Jan 2012
Location: Nashville, Tennessee
Posts: 2,107
My Ride: 2002 330ci
No. Its not rpm related. It's a low buzzing sound that's constant coming directly from the sub woofer with the radio off. So far I've seen bad amp and bad ground for possible causes. There are 2 amps. One for the sub and the other amp for the rest. The larger amp feeds the sub amp. So I don't know which is at fault.

Last edited by glhx; 03-06-2013 at 09:29 AM.
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Old 03-06-2013, 11:59 AM   #4
Jesse M
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Join Date: Oct 2010
Location: East Greenwich, RI
Posts: 457
My Ride: 05' ZHP
Only way to test the amp is to swap with a buddy and see if it goes away. I'm willing to bet there is a ground loop somewhere.
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