I have owned 3 Rel Strata III's, yet never had the chance to try out the spikes as I have oak floors troughout the entire house. It would spell disaster with a down firing sub on Tile, or Hardwoods. If you have carpet give it a shot? I doubt that you will hear any improvement? I used brown rubber furniture guards, & added self-adhesive felt pads under them. I place 4 of these under all my Strata's feet. It was a quick trip to the Home Depot, & less the $5.00 per sub system. It adds some dampening to the units. If you want to make dramatic changes, get a thin cork sheets for the top, & have a piece of 2" think Granite slab cut to size for the top, to weigh the sub down. For trial, have your significant other sit atop the Rel, with a towel not to marr the finish. The extra weight makes a major improvement with these light sub enclosures.