Check Tpsonic's system. He has what I've found to be the best combination for resonance management. Between shelf and component use Mapleshade IsoBlocks (or much, much cheaper yet and essentially the same material, V-pads from HCAV suppliers), then a brass footer like the Mapleshade HeavyFeet in direct contact with the bottom of the chassis of the equipment. Ideally the shelf should be wood or similar resonsnce-absorbing material.
Best advice so far is to avoid glass, marble, granite and other materials which tend to resonate.
Best advice so far is to avoid glass, marble, granite and other materials which tend to resonate.