Turntable Isolation

I had the trouble too with loose floor. I created a suspended platform held up by bungee cords attached to 4 small pillars at each corner. The idea is to put an appropriately sized board held up only by the four bungee cords threaded through those corner posts. I drilled a hole into each 2 inch by 10 inch post so the bungee can be pulled tighter or looser to perfectly level the platform. I have lock sliders on cords to hold them in place. Sorry no pics but I think you've got the idea. Now my wife can dance through the room, the bass can thunder, and my cheap turntable is playing very clearly. With turntables isolation and vibration cancellation is everything. This thing works great! Build frame first to hold posts securely far enough away to allow about 14 inches of bungee per pillar. Connect bungee underneath board. Thread through post and done. You should be able to push turntable and see it gently sway and quickly damp down any movement. Level adjustment by simply pulling bungee shorter or looser through pre drilled  hole per post. If you build square base first, securely attach four pillars at corners alls well. be sure bungees don't touch plinth. Only attach on bottom of hovering board. Success! Dance away!!