Theaudiotweek, only you speak of isolation. I said a rack is a starting point and to hear your system at its best you will need some devices that control and dissipate vibration from the audio unit's (CDP,amp,pre,ect.) outer case in order to hasten the removal of the resonant energy and the vague musical memories you referred to in your thread. I use no mud, rubber or carbon fiber either so I am not sure why you mention that as we were discussing ultras and their ability to act as conduits for vibration with either hardhats against units case or attached as footers. You still do not mention which rack you use, but even in your thread you mention rack AND PLATFORM SYSTEM,not just rack. And that is my point, you need more than just a rack, so your comments about isolation seem misplaced as vibration control is where the subject was. Also your statement to design a pathway for resonant energy to pass to ground is exactly what the ultras do and what I have been saying is needed BESIDES a rack.