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Re: Seismic Isolation for Loudspeakers (Bound and Gagged No More!)

207.236.97.130

Hi Barry:

I think we are saying the same things, with different words. We need to talk about the resonant frequency of the system, i.e. the speakers on the hips, not just the hips themselves. Give it a push (gentle, please!) ans ee that it goes back and forth before coming to rest. The amount of time it does this will of course depend on the smoothness and hardness of the surfaces, and the curvature of the cups. I think you found that gentler cups have a longer oscillation period, i.e. lower system resonance frequency. The problem I had in your first post was that you said something like Newtonian physics don't apply in your system. I would contend they apply everywhere. Amplitude of oscillation is a function of mass and forces, and if we have a large mass (speaker), lower forces (drivers accelerating and decelerating) then we see a smaller amplitude of motion, and therefore unnoticable doppler affects, especially if we keep these forces well away from resonance of the system, which you have. Again, I think we are saying the same thing, but in a different fashion. Let's just focus on the great music. Maybe some day I will give this design a try, but in my case I think my speakers are way to small (light) to keep resonant frequency low enough.

Cheers.

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