You may need to go back through your physics primers, fella's. Vibration isolation is most definitely acheived through a smaller support structure. A smaller suface area for transfer will isolate.
Spike It! I'm using these . You need to isolate the speaker from the tv. Blu-Tac and pads will still transfer vibrations to the tv. Cones and spikes are used to isolate while providing a solid support. Good luck, James