1. Start with 4 aluminum cones. I used some old Mod Squad Tip Toes.
2. 16x16 slab of granite.
3. 1/8 cork.
4. 1/2 inch neoprene rubber.
5. 1/8 cork.
6. Top with another 16x16 slab of granite.
7. Enclosed with a wood cradle to hide the mechanism.
The granite is from scraps from a shop and was cheap. The added 1/4 inch of neoprene to 1/2 inch thickness did help. Let me hear your thoughts.
No need for all that, or any expensive hifi products, just use 4 of these these under each speaker, Sorbothan pads it’s the best vibration isolater , they are 70 duro the heaviest duty and will support and isolate your speaker.
https://www.ebay.com/itm/4-LARGE-SORBOTHANE-DISC-CIRCLE-FEET-PAD-2-5x0-5in-64x12mm-SILENT-PC-AMP-FIRM-70D/372429364953?epid=1031478471&hash=item56b6851ed9:g:O04AAOxycmBS70F6
Cheers George