With the Podiums (or Pods) in place, the loudspeaker enclosure does not move in response to the moving mass of a woofer reproducing a very low frequency,
“For every action, there is an equal and opposite reaction”
Newton’s third law of motion.
The optimum outcome is for the spring material to deform to accommodate the cabinet vibrations which would normally be transferred into the substrate and anything connected to it. Leaving the speaker’s center of gravity to remain as close as possible to a status quo.
The materials and geometry of coiled compression springs lends itself to broad frequency isolation with a broad amplitude capacity in almost all directions. It’s been used in all manner of vehicles for quite some time.
Possibly one improvement that could be made is to allow them to spin on a bearing as they compress and decompress. Using multiple springs will result in friction as they each try to twist on different axis at the core of each spring. It would be interesting to discover if springs using the same rates wound in opposing directions make any difference in the manner in which they attenuate vibrations?
There is a way to drain cabinet resonances, using a TMD (tuned mass damper) as used in skyscrapers that help mitigate movement during high wind. Using a mass and a material that will deform under loads, so that the mass remains stationary as the cabinet vibrates.
