The best isolation i’ve found so far is tiles, go to home depot and get a couple of 20 x 20 tiles, that should do it. There used to be an Audio Technica solution in the late 70’s early 80’s AT – 605 better suited for turntables without feet or very low profile ie; SL 1500 mk2, but if your turntable already has some taller feet this would make them unstable and very sensitive. Now a very solid surface, concrete preferred would be ideal and the closest and cheapest would be tiles, i use them for playing vinyl in a small room and works pretty good.
