Platforms: granite, marble, maple or other?



What's the best isolation material for equipment platforms (amp and speakers on a wood joist floor)?

Stone: granite, marble, concrete?
or
Wood: maple, etc.?

Thanks
akaddict

Showing 2 responses by gregm

Viggen-- I, too, tried plastic cutting boards under my power supplies (pre & cdp). Not as successful as you; tonality and upper & lower extremes went away... strange.
Tonality is the wrong word -- sorry. What I meant to say is that instruments sounded less natural -- slightly "boxy" if you will... maybe related to the highs I lost? Cheers