My Inquiry has been to see if my Five Tier Plinth Could once more be suggested as it need not be expensive and has proved to be very attractive as a Base for a Speaker, with almost parity effect as a Suspension Footer.
The Base Tier Isolator could be Footers made from a 3mm (1/8") Wall Thickness Metal Perforated Pipe / Tube of approx' 50mm Diameter and 50mm High, this would allow air to flow freely at the interface with the floor and Support the Sub Sub Plinth off the floor.
The next Isolators and Sub Plinth used, will then be the ones with the Purpose to assist with Leveling the Speakers and add further improved measures for Isolation of the Speaker