AVS Forum Special Member
Join Date: Dec 2007
Location: Southern California
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Something that works really great to put under speakers is the thin rubbery "waffle" material they sell in RV stores to put on shelves to keep things from sliding around.
It comes in a roll and you just cut a piece slightly smaller than the bottom of the speaker with some scissors.
You do NOT want to completely "decouple" the speaker from the desktop; on the contrary.