Vibration dampening

Primacoustic Recoil Platforms are under both my speakers and subs.Their purpose is is to address floor vibrations.

All subs vibrate

thats what low frequencies do

save your money 

Iso 200 sub. Zero vibration in my setup.

I have used the same subs now for over 20 years. I used to think I liked the bass response. My son and I got a kick out of my walls vibrating during Welcome to the Machine.Then I put springs under my subs. Spikes or nothing allow the subs to "bounce" around and mine were louder and boomier. Now, I have more detailed bass notes and decay. The springs dissipate the vibration though heat. I can actually feel the bass. Yet, there is less wall vibrating and the bass does not shake the entire house. Some say subs are not needed but there is lots going on down to at least 25 Hz or so.

Springs should be compressed about 50%.  There are 6 coil springs in each assembly.  Individual springs can be removed if your speakers or subs are light weight.

Thanks, y'all.  Your recommendations are appreciated.  @ghprentiss, I had my kids and their friends at the house and they wanted me to demonstrate.  I played some of my favorites and then they needed some Motley Crue and Metallica and that's when I noticed it.  And the sub WAS kicked up a notch.