Maple platform under turntable, How thick?

Right. Stanwal, thank you. There is virtually no vibration coming from the floor so it seems that both coupling and decoupling should work. I think, I'll try brass cones first.
I wonder if anyone tried platforms made of other wood, say, oak, cherry, spruce, ebony etc. How about 5" thick snakewood or ironwood platform?

In my limited experience. Maple or Bamboo make realy nice platforms. Only reason I haven't made any platforms my self is due to the cost. Wood is realy expensive.

I found the Edensound Bearpaws add openness and Organics..The bass slam increases considerably..I used the ( Thorens TD160 ) Bearpaw Seniors ( 2" )on a 2" thick Maple Slab.....

I haven't experimented with all the ideas mentioned above, but I can tell you this... I put my Spacedeck on a 4" thick Mapleshade block on top of their included cork/rubber isolators and it transformed the sound completely. Amazing improvement, and this is in a system where the table and electronics are already in a different room from the speakers. Could another type of footer be even better? Maybe, but I never felt the need to go any further. The Mapleshade wood is a bit different from most others in that it is air dried and that is supposedly responsible for a better sound. I wouldn't doubt that it does make a difference. 4" is reportedly better than 2".

I use four inch thick kiln dried Mapleshade platform on islocks under my clear auido Chapion ll table on a four inch thick four self Mapleshade stand with great results. The turn table itself weighs eighty pounds. Kiln dreid maple is soft and to me gives a very good sound. In my experiences I get a very open, authoritive deep rich sound. As stated by Stanwal, tweaks are not a one thing fit all. I also agree with Thorman about the brass cones. I use Bearpaws and Mapleshade.