@slaw Having had my first Venture into improving the local environment for the Cartridge Stylus to function in back in the 90's, by having a Platter Bearing redesigned as a Build, I was now on the road to learning about Isolation through Separation.
This Journey headed into Materials and especially materials that have a positive impact on reducing Amplitude (reduction in migration of energies through materials).
Today I have a self produced Supporting System built up from a multiple of materials as Tiers for my Audio System, especially for the Analogue.
The Power Amp's have an alternative Multi Tier assembly of materials, which is very very weighty.
The Digital Source has been sufficiently looked after on a Bespoke Built Wall Shelf, which again has a decoupling from the Wall and has Multi Tier Supports.
Cabinet Speakers also have their own Multi Tier Assembly to support them.
These assemblies in use at the present have evolved over the years, where different materials and separators are adopted, along with different configurations for selected materials>separators. The set up in use is very very effective from a Subjective Evaluation, the tidiness of the End Sound is very attractive.
Occasionally I return a Source to a simple Sturdy Table Support as a retro set up and am shocked at the Crud that is captured within the End Sound.
Today my main interest as Material is Resin Impregnated Densified Wood Board, I am swapping out Materials once valued and am getting benefits worthwhile maintaining.