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.
