Granite under your amp???

I use granite under my speakers primarily to protect the hardwood floor. Results have be outstanding.

For what it's worth, I think granite would serve as a better base than marble - if you look closely at a slab of marble, in most cases it's held together with some kind of fabric. Marble is full of fissures and the cloth stuff keeps it from falling apart!!

If you are looking for something that is structurally sound, go with granite over marble - however the really pretty granite with buzillions of colors can be almost as fragile as marble. The "absolute black" granite seemed to be the strongest.

Brianmgrarcom, I too set my speakers w/spikes on granite. Believe it or not, it's not that easy to slide a spiked speaker on the granite. The spikes dig in and if your speakers are heavy enough, will scratch the granite.

My granite sits on hardwood floors - I have three small felt pads under the granite which allow me to position the speakers/granite with ease.