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You say it goes away when you turn the volume down on your stereo? In that case, it's feedback. What are your decks mounted on, and where are they in relation to the speakers? If you have the speaker on the same table or whatever as the TT, then the vibrations from the speaker travel through the table and make the turntable vibrate. This travels through the turntable and makes the needle vibrate in the groove, causing more bass frequencies to be transmitted to the speakers, which then make the table vibrate....
Basically, move the speakers onto the floor if you can, or somewhere other than where they are now. If you can't do this, try putting a folded towel underneath the speakers to out vibrations.
There is another method that I saw once, that worked really well... You get four plywood boards big enough to hold your turntables. Then, cut holes near each corner about 2" across. Then, get 8 tennis balls and put one in each hole and put one board on top of the other. Hey presto, you have two nice suspension systems for your decks!
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