I am guessing that you don't want to spend big bucks. You might try and find a used Bright Star Audio Air Mass. If you do use an air blader system, it is imperative to keep it level. There are othe types of isolation devices descussed here on Agon or other sites as well. Good Luck.
How to properly isolate a turntable?
When I hook up my turntable and drop the needle I get some very bad cone movement , this happens also when there is a lot of bass and drums. I would like to know how to properly isolate a turntable to avoid rumble. How can this be done without moving the turntable away from the speakers? Any suggestions?