That's a 18 inch by 4 inch circular "Chinese (how appropriate)" John Boos Chopping Block. Next step is to get a set of Mapleshade Audio Heavyfeet with spikes....
i have mine in my basement as well and don't have any problem whatsoever. That's the reason the PC4000 came with the soundpath feet. I think you are over thinking things...but it looks nice, probably just unnecessarywhy? the wooden base (or solid paving stone etc etc) is required because it is down firing. cement under carpet or not carpet and d/firing do not work that well.
spikes? no idea