I remember seeing a comparison of different tennis balls used for an isolation riser on here, but I can't seem to find the post now. I've read the threads/searched on here, including MisterMr's build plans and all billion of the responses and I also came across this link:
This looks like the most reliable comparison of different types of tennis balls, so I'm wondering if anyone has tried stage 2 or stage 3 balls and what your experience has been with them? It seems like stage 3 balls would give the softest suspension, which should give the best noise isolation, but I wonder if they are too soft and cause the kit to "rock" too much during playing?
My plans are very similiar to MisterMr's... rubber feet to the floor, a chip board sandwich with tennis balls (but also adding foam) and then some carpet padding and carpet over the top... and a cut out to fit my lunar roc-n-soc (the throne will be on the floor, not the platform).
The idea of the build is to make the suspension as soft as I can (without having too much sway of the kit), which I expect to spread out the impact energy from the kick and hi hat. then hopefully the foam will absorb any added acoustic noise generating from the stage (soundboard).. and finally the rubber feet to mimize direct contact with the flooring (I expect this should act as a high pass filter, for the problematic low frequency vibrations).