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#1
05-03-2006, 01:55 PM
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Ignition Noise in Speakers, Need Suppression
I replaced the power antenna and rear "added" stereo speakers on my recently-aquired 1988 560SL, and now have great sound, but I am getting a mild buzzing ingition noise in my speakers when the engine is running. It changes in pitch with engine speed. It's not there when the engine is off, so I believe that it is ignition noise.
Any tips or advice for noise suppression would be greatly appreciated. The car has a replacement stereo unit. Thanks. 
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#2
05-03-2006, 03:24 PM
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ground loops
sounds like a bad ground.
are the rear speakers powered by the deck or an amp? when you replaced the antenna did you use the existing wiring or new? somewhere on the line you created a faulty ground and have added noise into your system. retrace those steps making sure you have a good clean grounds, and stay far away from "noise suppressors"
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#3
05-03-2006, 09:45 PM
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The rear speakers are powered by an existing amp in the trunk, only the speaker wires are attached and the speaker housings are in the wooded deck and not separately grounded. The amp housing is grounded. Should the speaker frames be grounded?
The antenna is a Hirschmann universal type. I used two of the existing wires: power all the time (red); and the wire that provided power when the radio was on and antenna switch in "up" position. The antenna had a ground wire that was isolated from the large inner tube and coax coupling nut (they were common). I needed to ground that part of the antenna unit, as well as the ground wire from the antenna "box" for the radio and antenna to work. So I think the antenna is well grounded. Thanks for the assistance!
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#4
05-04-2006, 06:23 AM
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1. be sure to use the same ground for the antenna.. if you have two different grounds it will most likely be the cause of your noise..
2. try regrounding the amp good luck.
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#5
05-04-2006, 08:29 AM
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Thank you Rudolph, I will try that. There is a brown, factory ground wire that is part of the factory harness that went to the original antenna connector. I believe the origin is up near the radio. The other end, at the antenna location is currently hanging. Should the ground contact in that connector be grounded to the same location? The ground that I am using for the antenna is the factory ground screw which is located at a internal trunk body point that is a few inches from the antenna hole. It's a good ground. The amp has positive and negative wires that come directly from the battery posts (trunk batt location). The case of the amp appears to be common to the neg. Thanks for the great help!
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#6
06-02-2006, 02:24 AM
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Might be helpful
I had similar problem once with my 300E I had a seperate amp connected to the head unit by a shielded RCA wire for signal.I used the unit for a long time and all of the sudden started to hear engine noises in the speakers according to the rpm.I called the shop who installed the unit at the start and they told me to get a little better RCA cable preferrably gold plated plugs ,better shielding etc.I did that and that was the end of my problems.
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