Hi there,
For a year now, I tried to fix an issue I have with the H/K rear speakers on my 2011 JCW R57. Even if the sound is not loud, bass level is on the middle, source can be radio, cd, or bluetooth I can hear some vibrations. I have to lock the seatbelts otherwise it is even worst.
I went several times to the dealer and they told me they can not do anything. Or that I should put the bass level closer to the minimum. I love this type of answer when you pay to have a better sound system but it does not do its job...
I noticed there is no foam or anything behind the plastic parts at the back on the side. Do you have any tips to prevent those vibrations?
Thanks

 

Yeah this has been killing me since April!!

 

Well a few things come to mind on this issue. I have a clubman and heard a few different vibrations and it took a few adjsutments to make them all go away.

1. Panel used felt tape around the edges to keep the panel edges from contacting the door and that stopped most of it.

2. the mesh grill on one side was slightly loose to the plastic panel. I removed the panel and used a small amount of super glue right at the edge where the mesh (metal) grill contacted the plastic and that sound then was gone.

3. Seatbelts - with the buckle somewhere in the middle touching the panels the could at times rattle with or with out the radio on. moved the buckle all the way down or all the way up and it stopped.

Good luck. If you are still under warranty and dont want to tackle this yourself then make these recommendations to the dealer. and hopefully they will get it sorted out for you.