There is a slight whistle in my speakers whenever I have my volume turned down. It's pitch increases with rpms. What is this caused by so I can fix it? Is it from a poor ground or what?

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'92 300E
'74 Vette

Sounds like there is feed thru from the the alternator. You may need more noise supression on that component.

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Jeff L
1987 300e
1989 300e
1987 BMW 325

It will be a poor ground. Alternator noise is generally a buzzing rather then a whine

Best plan is to groun ALL audio components to the same point on the chassis (star earthing) remember the chassis of the amp is grounded aswell, so you must not screw directly into metal, o have the amp touching the chassis, else you end up with 2 grounding points, with a potential difference bwetween them, causing the amps to amplify this and give engine noise.

I have all my components (3 amp, 2 crossovers, headunit and PXA processor) grounded to the same point, and I have ZERO engine whine.

Hope this helps.

Bri

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Brian Drought
1991 300CE
http://www.users.globalnet.co.uk/~drought/
ICQ: 2180069

I did what Brian said; even the head unit goes to the same ground. And I avoided grounding my amps by bolting them to MDF, which is non-conductive. Result - zero whine.

Sometimes it's a pain in the a** but in the long run the right way is the only way (from a guy who dismantled the interior of his 500E 3 TIMES!!)

Shoulda listened to Drought from the start...I hate it when he's right, as it seems to be that he consistently is!

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Best regards, Michael
'92 500E
'88 300TE

Get a noise reducer, I had the same problem. You can get them in radio shack for about 15 bucks a pop....


Agron
1989 300E (107k miles)