I spoke about the acoustic embeddings of a system as primary...
But even electrical embeddings of a system matter a lot...
An anecdote:
I sold my big house and in this big house my audio system was connected to a secondary electrical panel at the second floor, then it was not connected directly on the main electrical panel of the house...
In my actual small one floor house , my system is connected directly on the main panel...
The decreasing of the electrical noise floor level is astonishing... The same gear give a more clearer outline of the sound source and a more transparent soundfield...My Sansui alpha, a very low noise floor amplifier, as many other good amplifier, go, metaphorically speaking, from low-fi or mid-fi level to super hi-fi as a costly upgrade formy ears experience...it was astonishing asw if i had another better system...
Acoustic and electrical and mechanical embeddings controls are more important than tasting gear upgrade with our ears, golden one or not, or by measuring their specs and saying that it is the ultimate KEY to audio...Sorry but as useful it can be, verified specs are not the key at all...
Why this is not evident for all ? The key is first acoustic, then electrical and mechanical embeddings control...
This war between people with their ears or tools around the gear components, resulted from the incredible blinders created by one century of gear marketing claims ...The marketers or the designers or the people measuring the gear, never sold us the idea that it is not enough to buy good gear and upgrade it, it is necessary and MORE IMPORTANT to learn how to listen first and doing so by embedding any system in the house/room acoustically, electrically and mechanically...
Acoustic is the queen asleep on the bed , our ears are the prince awakening the princess, the gear are only the 7 working dwarves in the room ...
«Acoustician use blind test time to time on some guinea pigs subjects for psycho-acoustic objective results in some experiments for example, but designing a room, no acoustician blind test himself, because he learn how to listen in doing so » -- Anonymus acoustician😎