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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

Showing 1 response by melm

melm
1,085 posts
 
FWIW I have a VPI TNT sitting on 4 hand balls, per the last of the VPI TNT suspension designs. It sits in a sandbox on a table, itself on a suspended floor. When I start hearing sound of walking on the floor, I know it’s time to change the handballs, about every 6 years. With new ones it’s quiet. I have a subwoofer that causes no problems whatever--and no high pass filter.

Since you probably have a different set-up, why am I relating this. Because it works so well that if I had a different TT I would get 3 or 4 flat pieces of wood, drill them out so that handballs could sit on them comfortably. Think Ginko.. And sit my TT right on them. Only other thing to do is to shim for level.  If the plinth didn't have sufficient weight, I would place it on a heavy cutting board and place the board on the balls.
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