Isolation Recommendations: To Couple and Decouple?

I’ve built an audio stand with a rather heavy (150 pounds) rigid base, and shelves that rest upon, but are not attached, to the support structures beneath them. (Pictures of the unfinished stand should be up on my system page shortly.) 

What is the best method for eliminating resonances in each shelf? 

My instincts tell me that spikes should be installed underneath the rigid base to couple that portion of the stand to the concrete floor beneath the carpet, but that I should be installing decoupling devices between each shelf and the associated support structure it rests upon. For the time being I’m foregoing using devices under each component, subject to greater attention later. 

In the past I’ve used inexpensive Vibrapods underneath individual components but with only some small measure of success. But whatever benefit they provide to each component, they will not sit on the support structure beneath the shelves properly as their base is too wide. I need something no wider than 1.5 inches, and my plan is to use four of them per shelf, one on each corner. 


Is Sorbothane the best material for dampening purposes in this application? Are spikes beneath the base, poking through the carpet and sitting on the concrete floor the proper method? 

For any of you who’ve already tried this, I’ve considered attaching USB-connected accelerometers to each shelf for the purpose of measuring and then “tuning” the vibration isolation system, whatever it may end up being, once it has its component resting on it. Has anyone gone to the trouble of measuring and then eliminating sympathetic vibrations in this manner? If so, is it worth the effort? 

Any experienced advice would be most welcome!