Spikes and hardwood floors.....what to do?

home depot pads...2 to 3 bucks

You could also determine the optimal location for the speakers with the spikes removed, and then replace the spikes and carefully set them in place. As long as you never move (or bump) them, the worst you would have is some small pin holes that probably wouldn't be noticeable.

Slip and stick feet from HD or most any home center these help damp vibrations but also stick to floor without damage once you break this friction seal you can easly slide loudspeakers over floor again without damaging.Once they sit a few mins they stick again wonderful feet I use these on my loudspeakers.Much better than cones or spikes.Work on carpet but if speakers tippy than you might still want spikes on carpets.

Pennies and other small change have always wound up being pierced by the spikes when I've used them.

A brass or stainless steel disc made for the purpose is a better bet and there are lots around. For vibration decoupling and an improved upper midrange, try a Herbie's dot under the disc.

(Steve Herbelin actually sells metal discs with damping pads attached, he calls them Herbie's Grounding Bases, but they cost more than some other devices.)

http://herbiesaudiolab.home.att.net/footers.htm

I have not heard verification of this but common sense tells me that a solid piece of hardwood, combined with the weight of your speakers should couple to the hardwood about as well as the hardwood flooring couples to the subfloor. If true then it would sure make positioning speakers a lot easier! Say a Boos butcher block cut in half and the handle indentions trimmed off and edges routed. Or there are guys on the Gon who would make to spec and match your speakers I bet. Hope that helps.