This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.
Ideally, your speakers should sit flat on the speaker stand
or floor. They shouldn't see-saw back and forth if nudged.
One good way to accomplish this is to use a small dab of
putty under each corner of the speaker. There are a few
common putties used for this, but all share the properties
of being very elastic and staying flexible indefinitely.
These putties are inexpensive, removable, and reusable.
Try either Blu-Tak, which is available in the UK from office
supply stores for cleaning typewriter elements, Faber Castell
UHU Hold-It, which is available in the US from office supply
stores for holding up pictures, DAP's Fun-Tak, which is sold
in hardware stores for holding up pictures, or Pritt Buddies.
 
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