...One problem I have found over the years is with spikes sinking into wood floors due to overloaded speaker stands... ...buy 2 24" x 24" smooth top patio stones and use them on top of your flooring (regardless wood or carpet). Set the speaker stands on top of the stones. Overall better results in my experience.
There are far more subtle (and visually pleasing) ways to prevent the floor spikes beneath your speakers or speaker stands from sinking into your hardwood floors than patio stones. If the speakers/stands are situated directly on the wooden floor, you can use coins or spike interface discs (spike cups) specifically intended to solve this problem between floor and the pointy end of your spikes. Most audio boutiques sell the latter and they look much more slick than coins.
If you have a throw rug between your speakers/stands and the hardwood, the above suggestion doesn't work. In this case I too recommend a trip to Home Depot. There you can purchase a 4x4 foot sheet of 1/4" "Hardboard". You have the lumber department sales person cut the sheet of hardboard down into two pieces a few inches larger than the base of your stands/speakers. Upon returning home, you slip the hardboard pads beneath the rug where your speakers are situated and place the speakers back on are sitting on a throw rug on top of 'em. Hardboard is so dense that the spikes won't sink into the material more than a millimeter or two even if your speakers or speaker/stand combo are very heavy. My current speakers weigh on the order of 150 pounds each and I've still found this to be the case.