Conecoasters from Soundanchors @ $14.00 each work great for me with spikes on my oak floors. My rack weigh 600+ lbs. with gear, if I went straight to the floor with the spikes the points would be visible in the basement! I also use Orchard Bay points, & pucks under my speakers. The only time I ever used rubber was under down firing subwoofers to keep them from moving around.
Hardwoodfloors and Spikes
What's the best to use under speakers on hardwoodfloors? Spikes with a base of some type under it or a "rubber" type foot?