mahgister, You may hear what you say you hear, but the phrase "damp the internal resonance" as a mechanism for what you hear is unclear.
You are right, it is unclear, especially for me....
I only tried to convey my experience....
I tought previously that only springs fine tuned under my speakers could and would do the job...
I was wrong....
Adding some mass on the load to compensate for the weight of the speaker itself and create a slight difference between the load on the springs that are under the speaker and those that are directly under the load on top of the speakers, create a better vibrations controls mechanism...
The only explanation that comes to my mind is that the 2 sets of springs with a slight difference in compression decrease the power of the standing waves negative impact that are associated with resonance...
But i am not a scientist by far...
The only fact is the fact i observed relatively to the tonal accuracy with a second set of springs.... The results is amazing and audible immediately...
Then i will wait for other’s explanation....