Generally I use Maple where I want to warm up a piece and Granite where I want to liven up a piece..I am sure there are exceptions to the rule but Maple-Solid State and Digital and Granite for tubes..Just my general rule...
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Hmm, interesting... so since I have tubes, the best bet is probably granite. Maybe I'll try the combination. Rodman, thanks for the link to Corian, but I was under the impression that total non-resonance isn't necessarily good for TTs? I heard phenomenal things about Neuance shelves... are they out of business? I'd love to get one but I never see any on AG. How does Symposium compare with the Neuance?
I think in this hobby, there are no absolutes. What I mean is, one type of isolation may better suit a certain component, while another will suit the other component.
For TTs, I believe the best is still a combination of high mass (granite or equivalent) and a medium density material (maple or composites). Granite by itself rings. Maple/composites absorb this ringing. Maple by itself does not remove very low frequency feedback from full range speakers. However if you put them together, maple/composite cancels out the ringing, while the granite removes the low freq vibration.
I would not recommend putting a TT high up between the speakers as this affects the imaging. Placing it low and/or along the side wall is a better option.
One of the most impressive TT isolation boxes I've seen is Charlieboy's:
The box is made of solid maple pieces. Maple is very good for vibration control. The box is 2 inches thick. It measures 6" tall x 24" deep x by 32" wide. The box is screwed together then Ii caulked the inside so no sand could escape. The box itself weighs around 60lbs. Then i filled it almost to the top with 100lbs of fine washed beach sand that I bought at Lowes for about 4 bucks a 50lb bag. Then I had a 1" thick slab of granite cut to the inside demensions of the box.You might be able to take some of these ideas and incorporate it into a larger audio rack.
I have found that heavy brass footers draw the tiny vibrations away from my turntable and into a 4" maple platform with great results. The sound became cleaner, tighter and more focused. If I had the space and money, I would do this for each of my components and place them in an adjacent room, away from the speakers. I use the system from Mapleshade, but I'm sure Walker and others may be just as good.
I also like the idea of a sand-filled maple box with a floating thick maple top (ie. resting on the sand eliminating all air-spaces.) All this under brass footers.