Support table or shelf for turntable

I've had good success cheaply using springs under my components if they have a very rigid/flat chassis. Otherwise, I've been using cutting boards and putting the component on the board. 

Getting the spring ratings correct is the hardest part and it's not that difficult. Plus, springs cost approximately $1 each, so I just purchase a few load ranges/sizes each time I order.

Next, I'd like to try platforms combining two different materials, such as wood and granite. Or two layers of granite...  

I used the Townshend Isolation Bars under my subs that killed the mechanical feedback coming through my floor and up my rack into my turntable. Before, a loud oscillating wobble sound, but after the Bars, nothing. I am pretty sure that the mechanical feedback, plus whatever other seismic pollution is also coming up my front wall as shown in the video link above.

Putting your turntable on a wall is definitely going to be an improvement over suspended floors. My daughter who's an architect with zero audio experience, told me that there is a lot going on in my front (bearing) wall. This was after I had the idea to tie my rack to the front wall for extra stability.

This makes, placing your turntable in another room on another wall a reasonable solution if that's what you can do. For me, I'm working towards adding isolation pods to my TT, amps, line stage, and phono stage.
Kenny

Me too Kenny, and my SACD player as well. They're about $375 for a set of three, so it'll take a while. I'm starting with the sources and speakers & subs. I would still love a comparison of the Townshend Pod to the IsoAcoustics GAIA.