I had the same problem with my wood floors and Utopia Sub. I ended up using Black Diamond cones screwed into Black Diamond Round Things. I am using 3 assemblies, points up against the bottom of the sub. I would think that in your situation you may want to use 4 assemblies per speaker for stability concerns. To eliminate any slight rocking due to uneven floors, just unscrew one cone from it's Round Thing ever so slightly. Good Luck.
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