Micro SX-8000 II or SZ-1

hi Peterayer, the same case (ie. speed instability) could technically be made if a turntable's motor, table & flywheel all rested on a single platform or shelf.
it's important to consider if motor, table, flywheel, & platform(s) beneath turntable & associated components are rigid or suspended.

Peterayer, what Tuchan is suggesting is simply a fixed separate platform on the same plane under each component instead of one large one for all three. Setting up of belt tension is no different from them sitting on one platform. Theoretically this way you're isolating each of the 3 from interacting with the others mechanical resonance.

11flat6, Yes, I agree.

Dkarmeli, yes, I agree with this as long as relative horizontal movement is fixed. However, I was more concerned with relative vertical movement between the three and this would be dependent on the type of isolation and if it moves in the vertical plane. I'm most familiar with Vibraplane platforms and if one deflates at a different rate than the others, problems with belt tension and thus speed may occur.

I suppose if the movement is slight and only in the vertical direction and the belt/thread has the room to move up or down the platter, but the horizontal distance remains the same, there would not be any problems.

Peterayer, in Tuchan's set up there are 3 separate fixed platforms sitting on top of a larger shelf. There's no movement in any direction unless intentional. Quality 4 point active air bladders will eliminate the issue you mention. Even then the affect of passive one loosing moderate level depends on the turntable setup or the equipment that's sitting on top of it. Personally I'm not a fan of air platforms under high mass tables, but that's relative to my equipment and tastes.

Love the moniker,11flat6.