@zonto, I used the SubDudes under my Rythmik FV15s back in the day, I now have SVS PB-16s and SB-4000s, all on SVS SoundPath Isolation feet. The foam on the subdudes is soft, open cell stuff. Your sub & the wood platform kinda 'float' on the foam meaning you can sway it around a good deal. Think of a worn out car suspension, kinda floaty, lazily springy. It works but I cant say its better than the SVS isolation feet, and I prefer the look of the feet.