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

207.236.97.130

Not really sure what hip joints are, but I gather it is a ball in a saucer type of deal, lateral resitance is provided by a centering force that returns the speaker to it's lowest elevation, i.e. when the ball is in the middle of the cup? I applaud your efforts and certainly cannot doubt the effect on your system, but there are a couple of things in your explanation that I do not understand. Firstly, I see the purpose of a spike or cone as two-fold. One is to provide an impedance mismatch to the vibrations trying to get out of the speaker into the floor and then the rest of the system/house/etc. The other is to firmly anchor speaker so all energy goes into controlling cone movement, not moving speaker back and forth. This essentially couples the mass of the house to your speaker. A ball and saucer would certainly provide the first of these, since the contact point between the marble and the ball is very small. All is well thus far. But, I do not think Newton's law is up for depate, and it cannot be broken. Your speakers would be constrained in the vertical direction (aside from what is translated into vertical movement by the curvature of the saucer), but not the horizontal. Note however that you have added mass loading (marble plate) that will reduce movements as well. I would expect a large movement may induce a doppler distiortion; whether or not it is noticable is for another time (and no, I have never heard this, only talk of it). In your system, this works very well, so go with it ;-)

Happy listening.

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