Half misconceptions in audio emerge from psycho-acoustics ignorance...
The other half emerge because we had different budget, different needs,different biases...
Room acoustics is fundamental, hilde45 is right... But physical Acoustics and psycho-acoustics ask for more than standard room materials...We can also use acoustics devices(resonators and DSP ) .
It costed me nothing to create my first acoustic room by ears except a tremendous amount of time and experiments...
I will never be able to do it again... Tuning by ears asked me 2 years full time ...
What i have now in nearfield listening is very good but less, way less natural and spectacular...I enjoy it though...I tweaked my super AKG K340... It is another story...
Room acoustics may cost few bucks, if you had time to learn and experiment it may cost nothing (my room was not esthetical though, my sons laugh without end but they were flabbergasted by the complete surround sound with no sound coming from the speakers).It costed time,thousand of hours to set it, but a free room to use...
Sorry but what i experienced with my 100 tuned resonators cost nothing in money but is unesthetical and impossible to implement in a living room...
We cannot have esthetical psycho-aoustic experience for free...it ask for a room, acoustically architectured at high cost but esthetical or at no cost unesthetical...I am not crafty anyway perhaps a very crafty person could had build very beautiful resonators ... (if you had a living room and basic acoustics treatment satisfying for you i will recommend you to read about Dr. Choueiri filters to upgrade)
My hobby was not just listening music but understanding acoustic, not just with my brain but with my ears...
My hobby now is mathematics foundations and methods with A.I.
To understand acoustics i need only a book written by a genius...But for maths it ask for many books and i am engulfed by an ocean... What is striking is that A.I. can takes my idea criticize them and use them and help me to develop them...If i had A.I. at the times for acoustics i perhaps would had save one full year of experiments using complex concepts and psycho-acoustics experiments...
I digress now as usual...

I forgot to say that i never chase for "perfection" only for optimization with a low cost system using rules which apply anyway to any system at any price......
I called it once i had reach it the " minimal acoustical satisfaction threshold experience" using 4 optimization process,mechanical,electrical,acoustical,+DSP...
Cables make a difference but so small compare to anything else, especially with a low cost system, that i pass over any cables threads as almost useless and deceptive, not because cables dont matter, they matter, but it is a red herring as many marketing conditioning compared to all others necessary optimization devices and process...