The only mystery for me is whether some room treatment might dramatically improve imaging.This is simple acoustic law...
The stuff I've read so far sounds awfully complicated though.
Yes it seems complicated... But it is not complicated at all with some basic principle in acoustic...
The only thing which was difficult but also it was all the fun, was the time it take me to did it right.... 2 years at turtle pace in the beginning, but a high speed in the last 3 months...
My room is now very good ... Peanuts cost and only fun.... But it is a dedicated room, it will cost me much more to install "esthetic " solutions, and efficient one in a common room...I dont even know if i could do it.....
The greatest asset for sound quality is not the costly gear, it is a room acoustically well set only for music....