Sounds like we have a lot of interest here. It addition to my first post, may I suggest that there is no substitute for experimenting. As for sources, for thicker or larger pieces I found that monument works are great resources. Many times they have large stones that have been broken, & are willing to sell them at very reasonable prices. Cabinet installers that use granite or marble tops are a good source for the thinner pieces, ¾” or 1”. You may also check out tile supply houses. What I usually look for is damaged or broken pieces & them let the supplier cut them in sizes I can use. These stones can be used to fine-tune most systems.
I have found that if I use larger pieces with components sitting on top of them that the spiked feet work very well between the component & the stone. Again experiment with what sounds best; there is definitely a difference in each method. For speakers, bolting the slab to the bottom couples the stone to the speaker, virtually making the stone a part of the enclosure. If the stone is not attached I would suggest trying feet between the speaker & the stone with a large piece of stone resting on top of the speaker. This adds to the coupling affect. Yes, by attaching the stone to the speaker you eliminate the need for spikes on the bottom of the stone, making it much easier to move or adjust your speakers.
I have also had great success using a partially inflated 12” inner tube under the stone for components other than speakers. Here again, experiment. I have found the affects of using stone & inner tubes to make great differences in what we hear & at a very reasonable cost. GOOD LUCK! & HAVE FUN!
I have found that if I use larger pieces with components sitting on top of them that the spiked feet work very well between the component & the stone. Again experiment with what sounds best; there is definitely a difference in each method. For speakers, bolting the slab to the bottom couples the stone to the speaker, virtually making the stone a part of the enclosure. If the stone is not attached I would suggest trying feet between the speaker & the stone with a large piece of stone resting on top of the speaker. This adds to the coupling affect. Yes, by attaching the stone to the speaker you eliminate the need for spikes on the bottom of the stone, making it much easier to move or adjust your speakers.
I have also had great success using a partially inflated 12” inner tube under the stone for components other than speakers. Here again, experiment. I have found the affects of using stone & inner tubes to make great differences in what we hear & at a very reasonable cost. GOOD LUCK! & HAVE FUN!