SVS Subwoofer Isolation feet. Will I lose bass?


Most of what I see about subwoofer isolation has to do with minimizing rattles or bothering the neighbors.  But what about a sealed subwoofer on a concrete slab?  Would these dampeners not "dampen" the bass as well?

My setup...  Dual SVS SB16s on a concrete slab.  I don't have a rattle problem and the room is 20ft tall so I can't afford to "lose" bass because of my shakey rubbery feet.  

I've read and seen many great things about these but I have a hunch it would hurt a sealed sub on a slab more than help.

dtximages
@bdp24    This is a video done by Townshed to promote their product right?  Have there been any/many independent users to cite similar experiences?  I've seen tons of great things on Isoacoustics and have a pair of Gaia II's (not installed yet).  

My question is mainly for the effect of a large sealed subwoofer on a concrete slab.  I would imagine, and some have agreed here, that the isolation feet would be detrimental to output in THIS situation.

I'll check out the Townshed vids though.