SVS Subwoofer Isolation feet. Will I lose bass?

Stopped me being yelled at by my wife upstairs. The bass was transmitting up the walls. Much much better after I put them on 

I run 2 SVS SB16Ultras and 2 SVS PB13Ultras. All are on the SVS isolation feet. Theater is on the second floor so I'm not on concrete but I did not lose any low end and as mentioned before the sound tightened up. Not to mention I run these subs at a gain of -24 and can still rattle light fixtures, doors, etc.... if wanted. With SVS typically if you lose some bass you have plenty of gain headroom.

I also have the Townshend platforms under Focal Utopia Maestro towers. I have no idea how the springs in these things are engineered but they are game changers.

"...but you lose some of the chest rattle."

That is good? Isn't it?

@pmg1223, in one of the Townshend Audio YouTube videos, Max explains the design and demonstrates the effectiveness of his Seismic isolator. Just do a search for the company name on YouTube, and all the videos will be made available for viewing.

I bought a $2500 subwoofer cable and it corrected all the booming and rattling.