Best sub isolation?

I would just get the feet and surely will do so but my floor is "special". After a year of trial and mostly error finally cured my turntable issue. Now my wife can dance through the listening/living room with no problem and never have feedback. Additionally the quality went off the charts. (Hyperbole alert) But the SVS SB 2000 will certainly create its own set of challenges. Springs sound right and Townsend is too pricey for this lowly music lover. So in the shop I go to create a spring loaded sandwich. I thought a bottom board and top board suspended by four springs should do the trick. Any tips on this idea? I like the plastic wrap and form damping insert idea. Sub only weighs around 50 pounds so shouldn't be too cumbersome of a situation. Thanks for everyone's help. I guess the subDude pad is helpful but only in a limited way. Suspended from ceiling on spring platform might work too?

Super advice everyone! Got me thinking outside the box....I have built a wooden frame 24" X24" X 6" with one semi heavy bungee cord woven back and forth creating a trampoline weave which being tested with the weight of the sub causes it to hover on the bungees, hence BOING BOING BOING. Did the same for my turntable (except it included a platform to set table on). [Took 10 attempts to get the right spring which isolated from foot fall and micro vibrations and sounded much better] Added foam feet with felt under sub suspension frame. Now to run the power cord and connections without crisscrossing over any other cords. Many ways to skin a cat i.e. isolate a sub. Thanks team Audiogon. Now for the listening tests. 

My floor is so wobbly and hollow, (I live in a 30' yurt), that I'd almost given up on using my turntable except when all 'traffic' was gone. Out of pure frustration built a four cornered bungee suspended platform attached to my component stand. Worked so well I was shocked so I decided to build a portable one I could just set on top of cabinet. Not so easy. Failed repeatedly and dramatically. Portable prototypes often made situation worse. The weight of platform, length and grade of bungee, stability of four corner posts, and need to hyper adjust level all contributed to isolation magic. On about attempt 10 I finally achieved and surpassed the original. Best of all, my cheap table now sounded fantastic. Isolation is everything (almost)