Lonely piece of marble: where should it go?
You will, as Frank pointed out, want to damp the entire surface of the bottom side with a quality dampening material. Only that will make the "ringing" stone slab not be counter-productive for these purposes. You're basically creating a constrained layer base is all, and in that instance the mass will be beneficial. |
Thanks folks. It is indeed marble, not granite (marble is plentiful in VT). I had searched the archives a bit before my first post, and while some warned of this mysterious "ringing", others have praised its sonic qualities for isolating tt's. Incidentally, I am in the process of chiseling the bottom so that it is completely flat (I am not afraid of using my hands since I am a visual artist, and marble is fun to work with). However, if the piece is not machined, would a lack of absolute uniformity in thickness matter? |
Mr_stain, make some art out of the marble. Forty years ago, may put marble on racket balls with slits in them. I still have the piece of marble on which we make bread. It was terrible for isolation. I would not recommend maple either; it robs music of its dynamics. I piece of thick granite sitting in sand is about the only way to use rock for isolation. |
There's an interesting description of a TT isolation box made of maple, sand and granite in this virtual system. He admits it's overkill at 275 lbs, but I'm sure it does a great job. Where can one buy granite? |
I bought it in Texas at a granite mine. Most tombstone dealers can probably get you some. Also it is now very popular for countertops. They might have leftovers that would be very pretty, but too thin for your purposes. Also machine shop suppliers typically have it for fine calibration bases. Their pieces might not be big enough for you. Finally, if you are willing to come to College Station, Texas, I have some that I will give you. I think they are 17 x 18 x 3. |
