Sorbathane under granite slabs for speaker bases?

My floors are raised wood. I  had a hell of a time getting the speakers to sound right.

 I tried just spiking them through the carpet and into the wood floors. Undefined  bass. 

Then I tried them spiked to granite bases.  Improved mids and highs. No bass. 

Finally, I bought a pair of Maple Shade unfinished maple platforms. I spiked the platforms to the floor through the carpet, then spiked the speakers to the maple platforms. Walla! Done. 

Double click on my icon, then double click again to see the Maple platforms under the speakers. 

Frank