Vibraplane or a similar air isolation device. Look on ebay under "vibration isolation"... I got mine for $300 (plus $125 shipping). Also picked up a new-ish Newport for $200.
I have a Townshed CD Siesmic Sink under my Tube preamp and it took it to a whole new level of improved performance! It was very well worth the $95 I paid for it!
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