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Old 12-13-2019, 10:41 AM   #1
jetson22
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My Ride: 325CI 330CI 328IS
Stereo humm?

Hey guys I have a 04 325ci and installed a kenwood kdc, new speakers, 5 channel amp and powered sub. I had a terrible hum so I grounded the stereo to metal brace bar in the dash and it took care of it. However when I hooked up the powered sub it returned. I have the amp and the sub grounded to underside of rear deck lid and I scraped it to bare metal. Any help appreciated.
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Old 12-19-2019, 01:09 PM   #2
jetson22
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Anyone?????
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Old 12-19-2019, 03:09 PM   #3
bmwdud121
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Have you tried grounding them to the same point? I had a terrible hum as well, and the only way I could solve it was by installing a ground loop isolator.
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Old 12-19-2019, 03:43 PM   #4
jetson22
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Thanks for the response. Ya I have thought of it. But I am trying to NOT have to run new ground wires the length of the car and taking all the interior apart again.
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Old 12-19-2019, 06:03 PM   #5
bmwdud121
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Maybe run a temp wire (don't bother installing it behind panels etc.) and ground it to the same point to see if it makes a difference. Or try a ground loop isolator (only cost me $5 and solved my problem).
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