I will only add that a room is like an hearing aids...You must fine tune it for your specific ears problems and structure...No ears are perfect....
You set a hall or a theater for group of people....it is another matter with small room early and late reflections, reverberation short time etc...
But SMALL room acoustic could be set for your own specific ears with Helmholtz method, not only passive materials treatment...
I will add that i am not a scientist but i devised listrening experiments and it is my method to reach hi-fi experience at low cost....
You set a hall or a theater for group of people....it is another matter with small room early and late reflections, reverberation short time etc...
But SMALL room acoustic could be set for your own specific ears with Helmholtz method, not only passive materials treatment...
I will add that i am not a scientist but i devised listrening experiments and it is my method to reach hi-fi experience at low cost....