Buy a table (with four legs, I know obvious) that will go on top of your subwoofer (and around it), then put it on top of that. It won't touch your subwoofer and until you get a rack to put it on, you'll be better off than having it on a sub.
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.