I have my Gershman A-G speakers sitting on pieces of 3/4" plywood. The floor is suspended (room over the garage). Between the speakers and plywood are wine bottle corks cut in half long-ways. They absorb some vibration while also providing stability. I was using pieces of Vib-X, but a fellow 'phile recommended getting away from it under speakers. The bass tightened up once I put the cork pieces in place.
Edits: 05/05/12
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