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.
“As you can see nothing gets through.” 

Max Townshend video demonstrating speaker isolation, AND it’s on a cement floor! Hel-loo!!  🤗

https://youtu.be/BOPXJDdwtk4