Granite Slabs

I recently put granite slabs under my Paradigm Studio 100..the sound is not worse then before if not better..my wife listened;she said the bass is tighter..slightly..but when I listen to it I feel like I lost some bass..or I feel as if the speakers don't rock as much as they used to before..or I am mistaken???..I don't know..can you help me??I would like to hear your experience with marble or granite under the speakers..did I really lose bass??(my ground is wooden..I used to have small carpets under each speaker before..now I have the slabs)