I'm going to be building both a riser for one of my couches, and a stage for my TV and equipment up front. I will have my sub, rptv, amp rack and speakers on the stage. First of all, I have a nice hardwood floor first now, but plan to carpet the entire room. From my reading, most people either anchor the riser to the floor with silicone caulk or something like roofing felt to isolate it from vibrations. I am planning on filling the riser with sand to take care of some of the vibrations, but the problem is, I don't want to ruin the floors by putting caulk on them, and I think something like roofing felt would slide a lot on a hardwood floor. Will the riser rattle a lot if I just put the wood directly on the floor even if its filled with sand?