Other resonance tuning devices besides feet- this has had quite a following and a reasonable bit of demand- the magic VPI brick. When placed strategically on a component , this eliminates hum and stray magnetic fields from a component that otherwise might hum- probably because it doesn't know the words. (Bad joke, I know, I have used it before). Since the advent of the toroidal transformers in power supplies this has not been as much of an issue,they used to be mainly constructed from iron plates.
The Tekna Sonic vibration dampers that you attach to the backs of your speakers, Totem Beaks (which look like tiptoes but are actually placed on top of the speakers), Mpingo dots, Shakti Stones, and several other offerings.
The Magic Brick is the only classic one so far that has truly endured the test of time. It helped establish VPI, which is now a huge analog company.
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