Theaudiotweak wrote,
"When energy is applied to soft spongy materials that are used in combinations with springs supporting a loudspeaker, everything supported remains in a state of continuous motion. By doing so, this negates the operational efficiency of a voice coil as the coil itself becomes subjected to this secondary flexing. Ultimately, the voice coil drives the entire speaker assembly and has to overcome the added inertia presented by the motion of the springs and soft materials upon which the cabinet rests. The constant motion and flexing with this type of isolation device manifests inefficiencies within the operational design of the voice coil."
i have been preaching pretty much the same thing, I.e., use only very hard materials for interfacing with iso systems. I actually don't know of any isolation devices that employ soft spongy material with springs but maybe there are some, who knows? This concept of soft spongy materials is somewhat related to the idea that one should not use spring type systems in series, for example arbitrarily using a spring-based iso device with a turntable with springy or rubbery feet. I have constructed dual layer mass-spring systems but certain precautions must be designed in to prevent interactions between layers.
"When energy is applied to soft spongy materials that are used in combinations with springs supporting a loudspeaker, everything supported remains in a state of continuous motion. By doing so, this negates the operational efficiency of a voice coil as the coil itself becomes subjected to this secondary flexing. Ultimately, the voice coil drives the entire speaker assembly and has to overcome the added inertia presented by the motion of the springs and soft materials upon which the cabinet rests. The constant motion and flexing with this type of isolation device manifests inefficiencies within the operational design of the voice coil."
i have been preaching pretty much the same thing, I.e., use only very hard materials for interfacing with iso systems. I actually don't know of any isolation devices that employ soft spongy material with springs but maybe there are some, who knows? This concept of soft spongy materials is somewhat related to the idea that one should not use spring type systems in series, for example arbitrarily using a spring-based iso device with a turntable with springy or rubbery feet. I have constructed dual layer mass-spring systems but certain precautions must be designed in to prevent interactions between layers.

