Wow!
It is very clear and very precise statement...
I believe you because in my limited experience the only way to optimize speakers, save for mechanical and electrical modifications is acoustic...
Price tag upgrade is generally way less powerful than these three embeddings modifications...
Am i deluded ?
I just modified and embed acoustically cheap very good speakers and i am in sonic paradise ? Without modification they sound unbalanced and bad... With modifications they are cinderella...
I dont believe in price tag , save in the case of few hundred bucks and some 20,000 bucks differences which are real improvement even without acoustics nor any electrical and mechanical modifications...
For me acoustics basic and components synergy goes a longer way than most upgrade...
My system is more than satisfying now , in his two aspects : modified headphones and small modified speakers box in well embedded acoustic corner...
Then if it was possible for me , it is for most people even without money...
But without understanding basic acoustic by experiments it was IMPOSSIBLE for me all my life...I learned this small step at a time in the last 12 years...And mostly in the last 7 years...By experiments with my ears.... If not this way , how can you understand what is "TIMBRE" as an acoustic experience ?
As a Dealer, I have access to great business partners, like Audience and LTA/Berning - and hundreds of thousands of dollars of sound testing gear. It was hard (really, impossible) for me to develop great sounding speakers, so I can imagine the difficulty of others - even if he is a top notch electrical engineer, Physicist, Sound expert etc. would have in building their own speakers.