Best type of metal for turntable platform?


I have someone that owns a CNC machine. And machine for me a metal platform to the dimensions of 16 x 13 x 3. Ive heard aluminum is a good metal vs price for vibration reduction. Does anyone have any recommendations? Any input would help. Thanks. 
deanshias
andrei_nz

Thanks for the info. Everyone on here has been very helpful. Do you know where maybe I cant find an exact schematic? I know that's asking for too much. He's the type that just needs the measurements and/or plans. 

Its puzzling to me how mini trampoline footers like the Isonoe can can be good for footfall.. I am intrigued though and might try them.  Once it warms up here, from influence of these replays, Im going to get under my floor and add supports to the floor. BUT! If I can find a way out of it.. Ill try it (without breaking the bank).
The floor supports will do the most if you can pull that off. I couldn't so had to do the wall shelf/platform I mentioned above. Your sound will improve dramatically when you remove all the vibrations!
The best by far is SYMPOSIUM ULTRA STEALTH EDITION this will give the best sound and isolation as well.Jump on on ASAP!!
So I decided on purchasing a Townshend Seismic Platform. Then when it warms up here im going under my floor in the crawl space and going to add supports to the floor. Then I'll ask my buddy to mill the platform.