Price has nothing to do with reaching the "minimal acoustical satisfaction threshold" .
Price is related to your budget limits and needs more than to the "minimal acoustical satisfaction threshold"...
I needed and enjoy now a desktop system for nearfield listening after i loose my acoustical dedicated room...
I own a top headphone too which sold for peanuts...
When optimized these two systems makes preposterous any envious desire to invest in very costly system...
My actual speakers system could be upgraded not because it does present displeasing limits, it did not when optimized, but anything can be improved with money...
I dont know and i doubt it if any headphone , be it the K1000, . Mysphere, or Raal can beat my k340 of ALL acoustics count...Then if i had the budget i would upgrade my satisfying speakers+sub for another set around 2,000 bucks (my actual set is peanuts and very good optimized).
I already had with my K340 a top system which cannot be beat easily ...
There is no sweet spot for all...
Too much different budget limits...
Too much different concrete needs..
Too much different knowledge level about acoustical,electrical and mechanical optimization and too much "tweaks" adding to this and DSP on top...
Too much different designs quality levels at all price...
Who knew how to optimize the K340 by the way if you read the few negative reviews of it ? (almost no one)
"my" sweet spot then is my actual 1000 bucks for all my pieces...
Beat me soundwise....Good luck...
The ratio S.Q./ price only makes sense... there is no sweet spot cost without basic knowledge...