You can blindtest some little change....You cannot blindtest total transformation because it is plain for anybody to see(hear)...It is no more useful for anybody ....
Blindtest is there to validate (marketting practice) or invalidate (debunkers) some small variation like with a cable...
No one blindtest the acoustic of the same room before treatment and after it.,..
No one blindtest the electrical grid of a house before or after it is controlled...
No one blindtest the audio system before and after his many resonant parts are under controls, even if it is easier to perform than for the 2 others embeddings...
My point is many changes are so evident than blindtesting them has no interest, except for those who sell some product and those who debunk some product...
Blindtest is there to validate (marketting practice) or invalidate (debunkers) some small variation like with a cable...
No one blindtest the acoustic of the same room before treatment and after it.,..
No one blindtest the electrical grid of a house before or after it is controlled...
No one blindtest the audio system before and after his many resonant parts are under controls, even if it is easier to perform than for the 2 others embeddings...
My point is many changes are so evident than blindtesting them has no interest, except for those who sell some product and those who debunk some product...