Thanks for your kindness...
But i just want to precise that i dont pretend to know anything deep or so special...
I only experimented with the three embeddings working dimensions of any audio system: mechanical, electrical and acoustical/psychoacoustical in a PRIMITIVE and very basic way...i bought no costly tweaks nor any upgrade piece when my system was chosen...I prefer homemade cheap devices...
But even a simple basic knowledge of acoustic very elementary for example will exceed in improving power any costly upgrade for most of us... I dont spoke for people able to afford 500,000 bucks audio system versus 500 bucks like mine... They will laugh at me...
But i laugh the last with my 500 bucks system....😁😊it is not so far away from a minimal quality threshold than most people think and in some case rival them...
Acoustic law are not for exemple based on expansive devices so much than on some simple experiments..
Tuning a room may cost nothing... It is not perfect but only the ratio S.Q. /price means something for most of us...And optimizing process cost time for sure and a dedicated room is for me the only necessary luxury in audio...
But learning how to listen is more fun than buying gear...we learn to " listen" with our brain to the system/room /ears not to the pieces of gear brand name....
But it takes curiosity and imagination and luck...unless you are coached by @mahgister who seems to have a better understanding of this stuff han most