I am using a Symposium Iso Segue under my Classic III and can't recommend it highly enough. My floor is suspended over a large crawl space and the Iso Segue really cleaned up the lower end.
Turntable isolation platforms
Need some reco's on turntable isolation platforms. Currently I'm considering the isoacoustics delos. This is another step in the battle to reduce acoustic feedback (see previous posts of mine). I currently have TT on a Pangea audio rack with a rumble filter with iso feet but want to remove rumble filter and use XLR input and not RCA. All ideas are welcome for a solid platform. GO!