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RE: Acoustics question

There are lab standard devices for this and some have been adapted for audio applications in the form of turntable isolation platforms. All include a compliance and a mass (which includes the mass of the object to be isolated). See: http://www.kineticsystems.com/page125.html and http://www.soundsofsilence.com/vibraplane.htm. Another audio-targeted set of devices can be seen at: http://www.stereophile.com/standsracks/500bright/

All these are too expensive for your application since you (and your neighbors) will need many. The DIY approach is to combine a small-diameter pneumatic tube, such as is used in bicycle tires, with a massy plate on which one can sit the device. One can then adjust the pressure in the tube to act as a LP filter below the offending vibration frequency.

The use of foam pads (as in the SubDudes) or resiliant feet/pods (as in the IsoNodes or Sorbothane devices) can be effective, depending on the offending frequencies and the geometry/mass of the device to be isolated.

Kal

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