Maple or Granite

Since you already have the platforms, consider trying both platforms under the TT, with five heavy springs between the two slabs (granite on top, maple underneath.) On-line at McMaster-Carr, P/N 96485K125. I think you'll be pleasantly surprised.

Agree with Dgarretson, except with the Maple on top, granite below.

I view the matter as transfering envirormental and TT vibration to ground. The Granite adds mass, so you put it on the shelf rack suspension to isolate and deaden the enviromental vibration.The 4 inches of maples will draw and dissapate the TT vibration away from it towards its furthest point in effect absorbing it as opposed to being reflecting back or being impervious to it. Thus the maple goes on top of the granite. I would not use springs they create a source of enenegy and will be reactive in both directions. If anything- put a dampening layer between the wood and the granite. I wood use only wood and maybe a shot filled rack.Adding more mass is supposed to be better but it is overkill for me. Thats My story and I'm sticking to it.

I have another variation of Dgarretson/Cmk ideas combined but with spikes or isolation bearings between the maple on top and the granite on the bottom, and TT directly on the maple. That will keep the design coupled. I have mono block tube power amps on an oak suspended floor adjacent to their floor standing full range speakers in this composition and it sounds great. I would only caution that springs or racquet balls create a additional suspension (uncoupling) if the Voyd TT is suspended, that’s usually bad news. If it is not, what is the logic behind adding a suspension to a non suspended TT? It may well defeat the sound qualities of a rigid design. Why not buy a suspended table in that case? Which I realize is not your consideration, I’m speaking rhetorically. Gentlemen, I mean no offense, I only wish to raise some questions to help us (maybe) all better understand the task at hand. Best of luck in any case.

Happy Listening!

I think it depends on your sonic preferences, equipment and setup.

I use a ~4" sandbox for my table. I first tried hard maple butcher block under my 'table. It was cut almost 3" thick and glued edge grain up. Dull, sluggish, boring. A granite slab is working better for me. But then, to give an idea of my sonic preferences, I also don't care for most every NOS tube I've ever tried. I want clear, neutral details with my music. I've heard from some that a 3/4-1" slab of aluminum is even better. Someday I'll give that a try.

My amp sits below my 'table. Also on a bed of sand and a granite slab. Here the granite is just to match the top shelf. I use Symposium roller blocks under my amp so it doesn't matter as much what the surface is.