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
The Mana from U.K. employed a great many glass shelves. The more the better so they said. Nirvana dual layer platform is a product. Hence the naming of it. But everyone knew it as Nancy. Building more than two heavy mass-on-springs layers wouldn’t work. It would be very unstable. The idea is to construct one dual layer device the right way. Sub Hertz performance. Hel-loo!
I am a newbie to this forum. Why are people arguing and fighting on here? I thought it was meant to be to help and advise each other in a kind and considerate way. Oh well.
@dyson2004 it's because everyone is suspicious of snake oil and people have different opinions.  The consensus here is:

the SVS feet will relieve vibration in walls and downstairs.  But on a concrete slab they probably do nothing positive for the bass.  Most of the responses here are about their performance on second floors where the sub shakes the whole house.

I have a brand new SVS PB 2000 Pro married to a pair of JBL L100 Classic speakers.  I tried the SVS special footers and found my sub lost its magic.  If anyone wants to purchase, the first $25.00 plus shipping cost shipped  to your door.  In my room, they took away some of the magic.