Granite under your amp???

Does somewhere like Home Depot carry these? How much would I expect to pay?

What exactly does it perform? (Reducing vibration...?)

As for support, I would place it on one of my shelves on my Sanus stand.

Surface plates (the cheap ones I mentioned) dont' come as thin as 1", 2-3" is the norm. Shipping weight on the 18x24x3 is 200-250lbs IIRC. 17x19 (weird size, btw...not going to find something like that off the shelf) x 1 is still going to be 50+ lbs., at least. It's tough to estimate the density of stone until you work with it in person. For the surface plates I mentioned, $45-135.
-Ed

Anybody tried this one?

http://www.tnt-audio.com/clinica/sblocks1e.html

KP

I bought a piece of scrap granite from the neighborhood tomb stone guy.It is ~16"x18"x2" 50-60lbs.Shiny smooth on one side,dull smooth on the other.I paid $20, wiped the bird doo off it and painted it black.
I have a diy amp stand under the granite.In between the stand and granite is a very thin sheet of foam like material I picked up at a hobby shop.
My Pass Labs Aleph-3 sits on the granite.I still have the stock Pass footers under the 3.They are pretty good for stock.
Since using the granite the bass is tighter and a bit deeper.Focus is a tad better too.No doubt worth the money and effort.

So Dave when you go over the falls is the granite gonna be going with you, I know the record collection is :) let me know when your gonna go for it, I'll shoot out there and if you make it we'll do diner. I have also been contemplating getting marble/granite/any cool looking smooth rock surface and getting rid of the aluminum I have been using. I have been using 1/4" thick T-6061 aluminum sheets for shelves for my audio gear, does anyone know if there will be any improvements going to granite/marble/etc?