Vibration dampening

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.

Concrete floor, stackcs of two hockey pucks under each spike with metal disc between, sub. Crossover and volume feathered in so that the bass sounds between the mains. wunderbar!

In talking about the spring pods to isolate, I actually put foam ear plugs inside the springs to act as a damper on the bounce and run one or two less springs in the setup. Effective loading without the wiggle and jiggle of springs and sound seems a little better overall.

And yes, pulling your sub away from the wall a little helps a ton to smooth out the response.

-Lloyd

I second the Auralex SubDude II..I used the V1 in a home theater for years with excellent results & still use SpeakerDudes in my bedroom system...