New Soliloquys with spikes and hardwood floors

Pennies are cheapest, you could go through other coins, but the next step up are cups to accept the spikes, I prefer to match them to the spikes... seems logical.....

Some of my favorite spike/bases are made by sound fusion.... nice speakers as well..

FWIW, spikes/cones do not isolate speakers from wood floors. They are very efficient at coupling your speakers to the floor. If you want to isolate you need something which is inefficient at conducting the frequencies you want to block. Nothing is perfect, but I use cheapo hock pucks. Hard rubber. Passes few vibrations that will effect the sound of your speakers than metal.

If you want to use the spikes get substantial metal cups. Years ago I tried spikes on coins with heavy speakers. Pierced the coins and damaged the floors.

Sound Anchors Cone Coasters.. Expensive yes but you can slide your speakers without damaging the floor (they have a special slider material on the bottom).
Newbee: is correct about piercing coins... I have experienced the same... Nickles from pre 1970 were the hardest if you had to do a temporary solution.

Sistrum makes some cone cups, plus their speaker sound good. I prefer the Sound Anchors because of the size doesn't allow the spike to slip out when sliding them into position.

You could float your speakers on Aurio Pro Max's also and then put some felt under the bottom of the Bearings so they don't mark up the floors.

You can buy metal floor protectors on which you rest the spikes or use four quarters which will work just as well.

Thanks all for your responses. I think I will try the coin trick first. That one will cost me less than a nickel.