I don't need to use a floating floor for my studio taking in consideration its a 10 inches concrete floor plus the tile underlay which I had put extra 2 inches then the usual over 1 inch tiles etc and I had a fitted carpet with underlay never had a problem with energy leaking to the floor below, but taking a close look to these photos, you see is a close up of the bottom of each wooden frame, I fixed with silicon 2 x 3mm carpet and on the other photo a 4 mm rubber carpet which is used for an underlay for basket ball pitches, I was lucky I got a load of this for free,... anyway all this will absorb all the vibrations from leaking to the floor.