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
Get a piece of 2x4 and place it between the back 
of the rack where your turntable sitting (center)
 and the wall .That should take care of footfalls.
A big 2x4 works for me. Every time I think of new speakers, turntable…my wife shows me the 2x4.  My listening room was a work shop originally and the floor is like a big spring -wobbling and shaking. A wall mount took care of that problem. I’m using the Pagoda Wall Mount. 
When I first treated my table for vibration control, I got a Townshend seismic platform which really improved the sound, but it actually created foot fall problems that didn't exist before because according to Max Townshend, the frequency was very low and the suspended floor vibrations were amplified.

He said to get a wall shelf or tread lightly or go back to inferior sound. I was able to get sign off on the wall shelf by the assumptive close and now have the table on top of the Townshend platform which sits on top of a Project shelf. Nirvana.
For a long time I had troubles with foot falls regardless of my turntable.

Bought a Sound Anchors equipment stand which helped the sound a lot.


But the foot falls were still a thing.


Then I got anti-vibration platforms to go into the stand, one for the preamp, one for the turntable. This helped the sound a lot.

But the foot falls were still a thing.

Finally I got a set of bearings which were placed beneath the stand on the floor. The bearings I got were Aurios Pro bearings which aren’t made anymore but I’m sure other bearings could be used. This helped the sound a lot.

It also got rid of the foot falls.


My house at the time was about 100 years old with hardwood floors and they were a bit saggy. But I could jump up and down in front of the equipment stand and not hear it. That was the biggest improvement. So I’m going with the idea that the bearings’ ability to relieve side to side energy is what is important controlling footfalls.
Mijo, I am rather surprised at your attitude toward isolating "electronics".  Perhaps you eschew the use of tube equipment as absolutely as you prefer spring suspended turntables, but anyone who does use tube equipment will know full well that tubes are sensitive to vibration, because all tubes are at least to some degree microphonic, and many types, especially some of those with larger glass envelopes, can be very microphonic.  Some of the more expensive tube equipment makers (e.g., Allnic) even go to the trouble of isolating tube sockets in an energy-absorbent gel. Without exception, I have found tube preamplifiers (phono and linestages) to benefit from isolation, and tubes benefit from "dampers".  As to transistors, according to Wiki one of their main advantages over tubes is a lack of sensitivity to mechanical vibration. And yet, many do use expensive isolation devices, for good or ill, with transistor gear.  Those persons would tell us what a huge improvement they experienced. Certainly, CD and DVD players do benefit from isolation, for obvious reasons related to the laser reading the disc.

Now, as regards the F22, in order for that airplane to fly, its piloting computer must be oriented in space at all times, so it can "know" how to maintain level flight and issue the correct commands in response to its pilot.  I have no doubt that its piloting computer must be encased in some sort of module that keeps it aware of level flight and is isolated from vibrations, because, like a phonograph stylus, if it is vibrating, even though its component parts are not sensitive to vibration, it might not be able to sense how to create stable flight.  Or perhaps it senses its own micro-instability and corrects for that.