I agree with @tomcarr
I've been at it since 1968. The most dramatic change I encountered in the areas that you are looking for occurred when I built a room that is in part dedicated to listening.
Bookshelf speakers that renders 3D soundstage
Recently I am on a quest to find a pair of bookshelf speakers under $2k that will render 3D soundstage. The soundstage does not need to be much wider than the speakers that are approximately 7-8 ft apart but, within the soundstage, I am particularly looking for the decent depth, focus image and pinpoint instrument/vocal separation. The other sound trait I am particularly looking for is the nimble, agile bass that could go down to around 45 Hz -3dB. The pairing amplification is going to be Parasound A23. If you have experienced / auditioned that, please let me know.