SVS Subwoofer Isolation feet. Will I lose bass?

My speakers actually were loaded with 70 pounds on each, and this was good... I will try someday juste the springs compared to the speakers loaded with weigh on my sandwiches....The weigh gives some damping, and the different densities materials I use give some coupling-decoupling but also some tuning.... I will compare someday with the springs with a bed of quartz....

So....i have an SVS SB16 and have it on a carpeted floor. Tried it without feet and the bass was bloated. The SVS feet helped tighten things up with not a significant loss. I then went to isoacoustic Gaia II with carpet spikes and everything is significantly tighter/cleaner than the SVS but you lose some of the chest rattle. 

My vote would be: If your looking for musicality the isoacoustic is the way to go. Dual purpose for music and theater the SVS feet are fine and enough of an improvement to atleast compensate for moderate cost. 

Good illustration of how carpets act as springs. Two spring systems one on top of the other is bad news. It’s like driving down the road in a car with two springs one on top of the other for each wheel.. It will be a very b-b-bumpy ride.

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.