For vibration control there is simply nothing to rival a product made by a company called MinusK. The MinusK vibration isolation platform, which was designed for use with proudcts such as atomic force microscopes, has a natural frequency of 0.5 Hz, horizontal and vertical! It requires no air pumps, no spring adjustments, no maintenance. Just place it on your shelf, adjust the level, and you are done. The price is quite reasonable at ~$2500. You can learn about it at http://www.minusk.com/ It is a serious industrial product, not an audiophile tweak. I think you wil find that it is amazing.
