Today I noticed that it vibrated a little bit just while driving. Nowhere near the loudness while listening to music. It most definitely is the door panel vibrating against the dash. Music is a passion of mine and the fact that I cannot listen to music in my HCH with quality sound really makes me upset. I really don't know if this is something can be fixed. But I am going to take it in sometime this week. I will keep you all posted on what I find out - if anything.