For those who wish to experiment with equipment spikes or cones. There seems to be confusion sometimes. Cones and spikes do not isolate or decouple (pick your term), they do the opposite and complete a rigid physical circuit. In other words, solidly couple equipment to whatever it is stood upon.

If you want to 'isolate', use pads of compliant material like Sorbothane or use feet that rely on springs for a similar effect. Although most spring feet have no damping, Sorbothane does self damp, which can be beneficial. Feet that contain rubber also offer some internal damping.

The choice of items to stand equipment on is huge, so pick carefully.