hardwood floors and spikes

I use Nordost power points in titanium.
Not cheap but quite effective and virtually invisible

I just read one members suggestion about using pennies. I did the same thing but I had Hales Concept 3's (180 lbs) with three sharp cones each. They poked right through the pennies and left little impression of Abraham Lincoln on the wood floor. Pennies or nickels are fine for lighter speakers but try the brass coupling discs with felt on the bottom. If the speaker isn't too heavy you can even slide them on the floor without damage.

I always thought the point of spikes WAS to "drive" them into the flooring, in order to anchor the speakers securely. If that's the case, what's the point of putting the spikes on something hard, that the spikes can't penetrate? What am I missing here?

Bomarc, I'll give you my two cents (pun intended) but regardless of the theory, the spikes on top of discs have worked for me. The sound is much more three dimensional and the midrange is tighter.

Here's my theory. First, the weight of the speaker is concentrated on four very small points so the speaker is more stable. Second, the indentations on the discs further help stabalize the speaker. Third, your spouse doesn't kill you for leaving holes in the floor and everything sounds better live ;-)

Lak is on target. AudioPoints coupling discs have been a very worthwhile investment for me.