Dear Listens2tubes,
I recommend trying first the balls and then putting butcher block or granite on top to see which sounds best. Mine sounded totally dead on top of my gel pads. I listened like that for a year thinking I really had it together. One day I thought why not try my unused butcher block. It was the difference between night and day. Which is preferable? Which ever sound works best for the owner. In my case I believed I needed a new turntable until I went to a rigid surface over an absorptive one. Now I'm thrilled.
Sincerely,