There might be a way to go ahead and use spikes or granite or prozac tablets (GOOD ONE, elgordo, but wouldn't that be lithium?) on your wood floors without marring them. Most woodworking adhesives will not bond to a finish. It's S.O.P. in the trade to put a little finish on exposed parts near glue lines prior to assembly to avoid glue contamination of the raw wood and uneven absorption of the finish after assembly. The glue is simply shaved or struck off with a scraper. PVA glues like Elmer's white or yellow or perhaps better, polyurethane glues like Gorilla could be puddled over carefully marked area where the points would contact the floor. The polyurethane or varnish finish would keep the glue from making a permanent bond even after years and any marring could be burnished out with the BACK of a piece of sandpaper. The caveat would be whether the weighted point of the spikes or cones would eventually work through the glue. Alternatively, for existing damage, Mohawk Industries makes colored shellac sticks which are melted into a finish for spot repairs, again using the back of the paper to blend. I buy mine from a distributor but they have a website or the sticks are available to the public from Garrett Wade in N.Y., also on the web. Perhaps someone with the time and need would experiment with Elmer's, a finished board, some spikes and weights.
Granite Under Speakers Over A Wood Floor
I would Like to use something over my wood floor that would not scratch it like the spikes do. I remember seeing sonus farber speakers on granite blocks. Does anyone have any experience with this? How would this sound?