Since you cannot afford a clean room electron microscope isolation table (+$5K, each), the bike/sand is a good place to start. Putting spikes on the corners should be done. After that its tweak, tweak until you find the improvement something that can be heard. I do suggest you get the system behind the speakers and put up a short absorbing screen around the stuff. as high as the top of the equipment. Kind a like 'circle the wagons. That should head off the typical acoustical vibrations that the speakers will set off in the room. The sand box will help prevent the equipment shaking. That is one reason to put turntables in another room, if possible. You would be surprised not doing so creates very difficult isolation issues in a room. Enjoy!
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