I believe that the very earliest vesions of the Interspace were all-wood in design, including the platter. Now, the platter of the Interspace is made of HDF with bronze perimeter weighting. The Spacedeck platter is of an alloy with perimeter damping. The Hyperspace has an alloy "sub" platter with a 25mm graphite "top" platter. The Anna has a gravity-spun cast iron "sub" platter with the same 25mm "top" platter. In addition, the plinth of the Anna is made from layers of pitch pine laminated into a spiral. It looks like a log - thus Anna Log! :-)
There is currently a thick graphite mat available for the Spacedeck, and Interspace, at the tune of about $280.
There is currently a thick graphite mat available for the Spacedeck, and Interspace, at the tune of about $280.

