Thread: rearview mirror vibrates.......what to do??

added a sub..and when it's loud enough for the mirror, it vibrates(duh, but with noise, i mean). if I slightly push it against the windshield it won't make the noise. any advise on how to make it go away?

Thanks!

edit 1: it vibrates at low amplitude of bass. the other parts of the car vibrates at a way higher volume.

edit 2: it feels like the vibration is from somewhere inside the mirror. it is autodim mirror..so it's a little thicker than normal mirror..does that make any difference?