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
I found the easiest fix for my customers was a wall mounted shelf (like the one from Project) on a load bearing wall. Worked every time. Hopefully there’s such a wall behind where you have your equipment set up!
I questioned the need for a SRA platform on my preamp and was assured by several that it was absolutely necessary. And when I asked if I also needed Stillpoints, I was definitively told that using them also would defeat the function of the platform. That it was designed for the stock rubber feet.
SRA has a military division which makes, among other things, vibration treatment for nuclear submarines. Thus, the Ohio and Virginia Class names for their platforms.
And about my preamp, if an electron microscope uses a vibration devise, why not a preamp?
Mijostyn, if everything boiled down to your personal experience, the world would be a simpler place to live, for sure. Tubes ARE microphonic, regardless of my or Ralph’s opinion. FYI, you may pay extra for quiet tubes from certain vendors, but what you’re paying for is lower than average levels of electronic noise, a good idea in a phono stage, but that spec says nothing about microphonics of that particular sample, which is a separate issue not usually measured by vendors, because microphonics will vary from one installation to another, even from one tube socket to another. 9-pin miniature triodes like your 6922s have a lesser tendency to be noticeably microphonic, compared to, say, octal base triodes like 6SN7 or 6SL7, so you’ve lucked out with your unit. But know that tubes can also become more microphonic as they age. Also, since the 6922 has modest gain factor, I am guessing your phono is a hybrid design, using transistors in combination with the 6922. This is another reason you might feel immune to the problem.