I find that stones are OK to very good if placed under turntables or speakers, or under equipment racks, but are not good as shelves for CDPs, DACs, Preamps or Amps. They all "ping" to some degree and you can hear it with electronic components, and they also store energy and release it slowly thereby creating a smearing of detail. The stones all sound different, and different marble sounds different depending on the level of impurity (more impurity sounds better). Thick acrylic sounds better than most stone, but suffers much of the same problem. Maple Butchers Block is better again, but being picky, images are enlarged and flattened, leading edges are slowed (as Brulee says), and there is a slight lack of presence (related to the flattening of images) - but if stone is 5 out of ten, then Maple is 8 out of ten. But do try stones under your speakers, particularly if you have a wooden floor - but granite is probably the worst sounding of them - others like soapstone, impure marble or sandstone sound better.
A Tombstone in the Living room????
I have read that granite is awesome to put under electronics.Ive also read how very expensive it is.I went to our friendly neighborhood tombstone maker and asked if he could sell me some.(yes he asked what I wanted it for) I hate that! anyway he showed me some "pet markers" 18"x 12"x2" at $120 !! Then he remembered he had a scrap piece.(polished on 1 side)30"x 18"x 3" he said I could it have for $20!! He offered to cut it for $10 so I can end up with 2 pieces 15"x 18"x3" for $30 anyway,has anyone used granite under their components and how did it work out?