hardwood floor and speaker

Don't make your wife unhappy! I have high quality wood floors and I use hockey pucks. Helps with a little bit of isolation from vibes traveling in either direction and are stable and cheap. Caveat, I don't think spikes really add much to sonic's except to stabilize the speaker on carpet covered floors. I don't subscribe to the theories about the cones either providing isolation or benefits by allowing vibrations to drain thru them to be dissipated by a wood floor underneath them. FWIW.

I use a 8x11 Persian rug on a pad and placed in the listening 'triangle'. The speakers are on the hardwood floor just off the carpet. It does damp floor reflections. Now if I could just put one of the ceiling. :-)

BTW folks, re using coins - this metal is soft and if you use pointed cones they can penetrate/dent the coins and you can still damage a floor if your speaker is heavy. Be careful!