Turntable platforms

I agree with @millercarbon on this.  Last year I bought a BDR Source Shelf and combined it with BDR cones that sit on BDR carbon fiber isolation pads.  The combination works extremely well under my table and I couldn't be happier.  

Another option if you can swing it would be custom Minus K.

Conspicuously absent is the Townshend Audio Seismic Platform (or set of four Seismic Pods).

If you have a suitable mounting point such as a sturdy beam, hang it from the ceiling. 

The platform can be a thick, say 5cm plywood or butcher's block. Metal might also work.

This offers almost complete lateral isolation, and with a little tweak to the cables, vertical isolation. 

millercarbon says,

Symposium and others pretend to do isolation. Really impossible, ultimately all anything can do is control vibration. Damp, tune. No such thing as isolation.

>>>>Are you channeling Michael Green again? You don’t even know what isolation is, do you?  Remember what the Little Train that Could says, “I think I can, I think I can...” Toot, toot! 🚂