Townshend Springs under Speakers

If it was cabinet resonance, then a board green glued to the bottom of the case might help.
I would like to see some evidence that they reduce HD.
Putting the speak on a plate of steel or rock would seem to make more sense to me. 

Well I have owned the Star Sound Sistrum and Townshend Pod products and have heard first hand the differences each approach has to the resulting sound. Speakers on a hard wood floor with crawl space under the house. The Star Sound Sistrum platforms were great. They tended to spotlight the highs and upper mids while speeding up and tightening the bass. Improved focus and inner detail. Less blurring of massed instruments.

The Townshend Pod products removed noise and made the music sound much more at ease and enjoyable. More natural if you will. They made the music more fun to listen to in my experience. That is how I experienced both methods of “isolation”. Just my experience and I realize this topic is more complex than my singular experience.

What if you used both products at the same time?

I did not, but could be interesting.  I have the Townshend Pod products only. 

Putting the speak on a plate of steel……would seem to make more sense to me. 

They call them Sound Anchor Stands