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Just get Vibrapods or some Sorbothane feet that have the "active weight range" equal near your turntable's weight.
I built a custom platform for my table using vibrapods, sorbothane, silicone coasters and neoprene with a marble slab on top of it that I got for $45 at a home/kitchen store (it's a pastry board). All absorb at different weights and frequencies, and the table is super smooth now.
Note the correct use of the term infra-sonic. Subsonic is when your F-14 is not lighting its afterburner. Kudos Sydney.
Yeah, I wanted to mention that, but I already take enough flak for expounding on damping and dampening.
A lot of stereo components use the term subsonic, so apparently it is acceptable regardless of how irritating it is to some of us.
5th Generation fighters can achieve supersonic speeds without the use of afterburners (Supercruise). The F-14 isn't in use anymore, well not by the U.S Navy, they retired them.
Way back in the day, my brother isolated his turntable using hand balls placed in spray can caps to prevent them from rolling. He placed those under the corners of the turntable. This gave good results and was much cheaper than what they were marketing back then.