Can I put receiver and CD player on top of my sub?

Is it ok to put my receiver, cd player, and dvd player on top of my subwoofer? It is a big sub (15" getting 200 watts), the width and depth of the cabinet are long enough to provide a solid base for the electronics. I'm just worried whether vibrations from the sub will damage my electronics. Assuming CDs and DVDs don't skip, is this safe? I would really like to do this because it would be space efficient for my bedrooom.