Granite under wood for better isolation?

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!

I have had good results using different types of isolation materials in combination. In my system, I use various combinations of maple, carbon fiber, sand, and viscoelastic materials, sometimes combining as many as three different materials under the same component. I have found that combining materials offers a significant improvement over each material used individually. I have not, however, experimented with granite, so I cannot comment on the likely results of combining it with maple. But I think your experiment is worthwhile. Good luck.

try just the maple and place Vibrapods, one at each corner, as footers. VPods are rated by weight loading; add the total and divide by four, then size appropriately.

Or try the granite with cones below the maple / atop the stone. Vibrapods under the granite atop the rack shelf.

A sheet of pink bubble wrap is another good iso material. The pink is antistatic and heavy duty so air will not leak out.

It appears what you are actually doing is coupling the materials, rather then isolating them. Try the vibrapod suggestion, very inexpensive. However, if you need the ultimate solution, best to get base like they put electron microscopes on. They can be had in the used market for about $20K. I know of a guy who did the latter for his $200K table.

I went the granite route under my table as well, and then discovered what a mistake it was. Granite rings at fairly high frequencies so you can hear the smearing that results. But it looks wonderful, Dakota Mahogany granite.

I also tried a hard maple shelf before the granite, which was also a mistake with my table. The wood tended to soften attacks so the wood smears in another way.

Best solution I have found so far for my stand and table is to use Stillpoints between the granite and table plinth. The vibrapods would probably work also, but I would suggest listening for any softening in the bass and in attack. I'm not really sure how much they allow movement since I have not used them. I do hear slight loss of bass slam with the Stillpoints, but I can live with that until I find a better solution.

Best of luck. Don't get discouraged, you may have to try several things until you find something that works well for your equipment and tastes.