I presume the loudspeaker/floor interface decoupling products you are refering to are products like the Cone/Spike Decoupling Gliders and/or Cone/Spike Grounding Bases etc.? As you may know, I use the former which when I fitted them, I was amazed at the level of all round improvements I got. I had always thought the improvements are all from the speakers being decoupled but what you are saying here is that some of the benefits may actually come about from there being less vibration being transmitted into the floor which may be affecting any components which are placed on the floor. My power amp and Mains Conditioner are both sited on the floor due to lack of rack space though these are supported by Herbies Iso-cup & Balls on an insulated platform.
Given that my speakers are already isolated by Cone/Spike Decoupling Gliders, am I right to assume that there should be precious little gain to be had be shifting any floor supported components into a new rack?
Many thanks for your advise Steve, and Happy Holidays to all.