Granite under wood for better isolation?

Where do you live? Under the El? How much rumble can there be?

2 inch thick maple ought to do it by itself without the granite. But if you just need a place to store the granite - well, underneath the maple would work.

I have a similar setup with a 1" granite base. I used a 1" MDF board and sandwiched a 1/4" cork it has isolated all floor noise to zero and ever getting back to my turntable. MDF is allot cheaper and more effective.

Go down to your local home depot and pay $1.00 for a scrape piece. They will even cut it to size.

Enjoy Music!