Vibration from Harmon Kardon Subs
I am new to the site but I am desperate for some advice.
I have a 330CI E46 with the Harmon Kardon system. The problem is the subs under the parcel shelf are vibrating and it sounds terrible. I have even replaced the speakers thinking that may be the problem but it hasn't improved the sound.
Any assistance with solving this issue would be greatly appreciated.