If you want to stop vibration Beech, Maple, Oak, a bowling alley...all of these are way too hard. Unfortunately there are several schools of thought but I would recomend using 1/2 inch mdf glued with 1/2 or 3/4 spacer and glue edge strips all around and put sand on the inside.
They will be heavy, but they will stop vibration.
They will be heavy, but they will stop vibration.