Originally Posted by hmmm5
of course depending on where your audio room there are other important considerations that come into play that have little to do with audio performance. for example if below grade than you'd be remiss to not go with floating (and put a thick mil of plastic down underneath the cork/sound barrier/etc.), but that's talk for a different forum I'm sure...
Based on my experience with a floating floor we installed in a bedroom several years back, claims of non-resonance based on the mass and interconnectedness of the surface ring true. This floor was laid over an existing highly damaged oak floor with no resilient interface, so it is probably a worst case implementation.
I wouldn't put much hope in attenuation of vibration being transmitted through the floor even if a resilient interface were used. Studio floors with that feature achieve it by vastly different means.
Floating floors attenuate well, but only above their resonant frequency. Getting a floor suspended so that its resonant frequency is at a sufficiently low frequency takes a lot of mass and a very soft suspension. The foam sheeting used for this purpose with so-called floating flooring is IME way too stiff given the minimal mass that each square foot of it suspends.