Townshend Springs under Speakers

Stringreen,
Respectfully, from what I understand about how they work, I can't see why they would be more or less effective on those two different types of floor. I wonder if you or others hear could weigh in with details about why this might be so.
Thanks, John 

Because allowing the cabinet to move, especially in a low cabinet resonance, pistonic motion, time and phase design smears the signal. On a moving floor this smearing is already happening. RV actually tested the subject product and wrote about the plus / minus achieved by him with his speakers, including measurements and listening. 

As i recall the OP here has 5a.

As always, other speakers or floor combinations may benefit.

Also both the Kento and new 7 extreme use a force cancellation alignment of the unique to Vandersteen Scanspeak bass drivers, reducing already low cabinet movement. 

Fun

Since 1977