Theaudiotweak, about non ferrous knife edge- How about a ceramic knife blade!!!
about airborne vibration, I have seen using weight (mostly lead)
on power and signal cables for some time with Wonderful results.
One need put the right amount weight, of the right type, in the right places. Achieving that produces exceptional low noise, air, bass, dynamics, detail and listening fun.
I have 2 five pound lead filled wood blocks on my CT-1 U Speaker waveguides. as well as the Mini's and platforms mentioned by Tbg