Resonant booming noise in c200 amg line
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C200 AMG LINE 2016
Resonant booming noise in c200 amg line
Driving a c200 amg line 2016. Have a resonant booming sound from drivers foot well. Starts at 15mph on smooth road resonants at 30 MPH and continues at various levels at higher speeds. Influenced by road surface so suspect it is driven by a component of road noise.
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Same car, same noise.
do you have airmatic?
what size of wheel? (18/19")
what brand of tyre?
do you have airmatic?
what size of wheel? (18/19")
what brand of tyre?
Last edited by ManiacGT; Jun 11, 2017 at 04:40 AM.
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C200 AMG LINE 2016
18 inch and Continental. Noise could also be described as a buzz ! Local dealer has tried and failed to minimise. Normal suspension. I suspect that the front speaker resonamce chambers culd be involved since the sound seems to be a fixed frequency and fairly pure. Unlike normal road noise which varies according to speed and road surface conditions.
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18 inch and Continental. Noise could also be described as a buzz ! Local dealer has tried and failed to minimise. Normal suspension. I suspect that the front speaker resonamce chambers culd be involved since the sound seems to be a fixed frequency and fairly pure. Unlike normal road noise which varies according to speed and road surface conditions.
there have been other reports of similar on here and I read elsewhere this has been cured by other people removing the continental tyre and replacing with the likes of Pirelli.
Last edited by ManiacGT; Jun 11, 2017 at 10:45 AM.
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C200 AMG LINE 2016
Thanks for your interest in this item. I have been working at it for a couple of months. The local dealer has been very cooperative but I am surprised that they do not have more info on this. I have driven a c class diesel and a b class diesel as courtesy cars and I can detect the same noise on both but at a much lower level.
Once you tune into this noise you can detect from about 15mph on very smooth road surface and then on up. The level of noise does change with speed and road surface but always sounds the same. It is possible to isolate this noise from the other noises in the cabin including road noises. The noise also is generated inside the cabin and is not coming from outside the car.
The common feature in my experience for this noise has been the bass speaker resonance chambers. Just a theory.
Once you tune into this noise you can detect from about 15mph on very smooth road surface and then on up. The level of noise does change with speed and road surface but always sounds the same. It is possible to isolate this noise from the other noises in the cabin including road noises. The noise also is generated inside the cabin and is not coming from outside the car.
The common feature in my experience for this noise has been the bass speaker resonance chambers. Just a theory.
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2016 C300
I know when we did the Audison upgrade on the Burmester we got these random bursts of boomy bass that I hadn't heard before. We traced it back to the Vehicle Noise Compensation circuit in the Burmester getting confused and compensating for stuff that didn't need compensation.
Does the noise stop if you shut down COMAND?
Does the noise stop if you shut down COMAND?
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C200 AMG LINE 2016
I have an electronic engineering backround but thermionic valves were in use in my university days so no recommendation there - just makes me inquisitive.
My theory is that a component of the vibration which occurs between the road and the wheels is transmitted into the front bass resonance chambers and finds a resonance. This produces a clean resonance frequency which is audible in the cabin.I describe it as a buzz or drone or boom since it is very subjective. This vibration component remains at various road speeds and surface conditions but various types of road noise will be audible from outside the cabin. These noises are superimposed on this basic noise which can still be isolated by the human ear. Just a theory and welcome any comments to completely ditch it !!
My theory is that a component of the vibration which occurs between the road and the wheels is transmitted into the front bass resonance chambers and finds a resonance. This produces a clean resonance frequency which is audible in the cabin.I describe it as a buzz or drone or boom since it is very subjective. This vibration component remains at various road speeds and surface conditions but various types of road noise will be audible from outside the cabin. These noises are superimposed on this basic noise which can still be isolated by the human ear. Just a theory and welcome any comments to completely ditch it !!
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There is another post on here with a video showing this. I can't find it despite trying but I've seen it and it examples the noise well.
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I tried recordIng the noise (the droning, not the fart) and just got hiss from road noise. I'll keep trying to find the original road noise post.
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Meh, I found the post but the video has been removed 
https://mbworld.org/forums/c-class-w...e-problem.html
https://mbworld.org/forums/c-class-w...e-problem.html
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2016 C300
Originally Posted by Gungaslow
Does it kind of sound like a wet polar bear fart by any chance?
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From: DFW
2022 E350 Diamond White Metallic, 2016 GLC300 Dakota Brown Metallic
Originally Posted by Mike5215
Technically if its consistency can be described as "wet", it's more than just a fart. I believe the medical term is "shart".
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C63s
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From: DFW
2022 E350 Diamond White Metallic, 2016 GLC300 Dakota Brown Metallic
Originally Posted by auditoamg
Code brown, definitely worse than a code yellow.
Says the two of us who clearly have a medical background (or know someone).
Says the two of us who clearly have a medical background (or know someone).
Last edited by dieseldoc; Jun 13, 2017 at 03:30 PM.
