I have not heard it mentioned so far, and I have not tried yet, but maple butcher block is supposed to work great. I have tried the sandboxes, homemade and bought and the seismic sinks too, as well as a lot of diffrent footers. Hidiously expensive and heavy, though in terms of the improvment brought out a great deal is the Vibraplane. It is hands down the best isolation device I have ever used. It is sort of similar to the seismic sink exept that it has seperate chambers so that the air can move freely between the foot and the storage chanber, it also weighs 150lbs. The improvment it brings out is undeniably huge. You can order them factory direct from Sounds of Silence, Steve is a great guy to work with.
Shelf Material
I have tried so many different shelf materials, and some are better than others, but I feel like I am just spraying bullets that always miss the bulls-eye. So far, I cannot live with the brightness of glass, the ringing of marble or granite, the sluggishness of acrylic, the muddiness of mdf etc. Light and rigid seems better than heavy and dense - in that I can live with the downsides more easily. I use heavily constructed welded steel racks - spiked to the floor and upward spikes supporting the shelves - and I reckon this is right. I like the way bladder products get rid of the resonances that plague shelves, but find that the way they slow down the pace of the music is hard to accept. Does anyone have some answers on this?