How to isolate turntable from footstep shake or vibration


Even while the Oracle turnable that I use has a built-in springs suspension by design there is a low or even sub-low frequency boom every time someone walks in a room. This becomes really bad with the subwoofer’s volume set high as the low frequency footsteps make straight to subwoofer where they are amplified shaking everything around. It seems the cartridge is picking up the footsteps very efficiently as even a lightest foot down becomes audioable. What can be done to attempt to isolate the turntable from the low frequency vibrations? Interesting, that the lower the volume of the subwoofer, the less the footstep shake is evident and with the subwoofer turned off it is a barely a problem at all. 
esputnix
A lot of people use some form of butcher block under their turntable, anything from a basic cutting board to dedicated audiophile offerings that have integrated isolation feet. Take a look at Butcher Block Acoustics, Isoacoustics, or Mapleshade Acoustics to name a few.

The springs in the turntable are to isolate the turntable from higher frequency noise. Not footfalls and subwoofers. Typically the solution on floating floors  is to decouple it from the floor and use a wall mounted turntable shelf.