Greetengs everyone!
I'm having a wierd issue with one of my2004 W211 rear Harman Cardon speakers, the rear passanger side deck speaker starts buzzing/ making noise tight after I hit 40-45 MPH . While the car is in low speeds or parked no noise whatsoever, and when it buzzes it's the constant noise level, doesn't change when the car goes faster. And as soon as it slows down bellow 40-45 MPH the noise is gone.
At first I thought that the speaker is blown but when the car is parked the sound is crystal clear, acctualy if I turn the volume up the sound is still great, there's just that low level buzz that's going on my nerves!
If anyone has any idea what this can be please let me know before I take it to the stealership and get ripped off!
Cheers!

 

Maybe a grounding or wiring issue with that speaker that is exacerbated by driving vibrations... my advice though isn't to take it to a dealership but an independent car audio shop to have them look at it and do any necessary work. It'll probably help you when it comes to cost

 

Thanks for you reply! I'll probably look for some audio shops close by , it's messing up my nice ride!

 

No worries man welcome to the forum! Hopefully you can get this fixed, I know how annoying it is to have a rattle/buzzing/sound from the car when there really shouldn't be any. Let us know what the result is