The bookshelves in the bookshelf is working out fine with the exception of all of the vibrations that are transfered to the shelf. Even at moderate levels, the vibrations are easily felt. While the volume of the music being played seems to drown out any audible resonances that the shelves may produce, I can't help but think that they are adding an unwanted color to the material.

Would I need to decouple the speakers from the shelves or am I worried over nothing much?