I have laminate floors. My subs are on SVS Soundpath feet, then on a heavy travertine plinth, then on rubber and cork anti-vibration pads. Definitely tightens up the bass.
Vibration dampening
After reading the article on Herbies isolation products, I got to thinking: My sub has more vibration going on than anything else, at higher volume you could put your hand on top and it feels like a massager..I am using spikes on thin carpet with concrete underneath. Has anyone had positive results with these or other isolators? It is a Velodyne DD12.