After using Mana 4-tier rack & spiked speakers (still have the Mana rack, it looks cool), I have now decoupled everything (some bits I had, but I bought the Bright Star stuff in):
4x Large Bright Star IsoNodes under each speaker stand
4x Black Ravioli under the amp (bottom shelf)
4x Large Bright Star Isonodes under the DAC
8x Small IsoNodes under preamp box / preamp power supply box
CD transport is on the top, on an SRM/Tech acrylic / sorbothane platform
Benefits are very clear an obvious in my old suspended wooden floor terrace:
* No more bass 'boom' (floors singing) around the house
* No more bass boom next door unless very loud
* More focus and cleaner top end
* Cleaner at higher volumes
It's been a surprising adventure, and what I would term a 'significant' upgrade for less than £150 new.