I have a 2012 300c AWD with all the options-including the upgraded stereo(Harman Kardon). With some music, there is a pronounced vibration coming from the back deck. There is a YouTube video on this exact issue (autosavant).
Does anyone else have this complaint? I took it to my dealer and we compared my issue with 2 other cars with the same system. Both did the exact same thing. This must be a defect.
Others have this problem? Did you get it fixed? If so, what were the steps?
Thanks for your time. Nice site!