I do not think speaker positioning is a black art. It can be taught and learned. Jim Smith's book and DVD are good places to start. I agree with MikeL that one must start with a reference or idea of the sound he wants. From there, one must proceed in a methodical, precise and deliberate way. Live music and a willingness to listen analytically help. Patience and experience help too. Listener location and speak position and orientation can do more to improve the sound of one's system then almost any other change. And all it takes is time and effort.
The result can indeed be magical, and in that sense, one is left wondering how these mechanical and electrical devices can sound so convincing, and bring so much joy to the music lover, but I would not call it a black art.
The result can indeed be magical, and in that sense, one is left wondering how these mechanical and electrical devices can sound so convincing, and bring so much joy to the music lover, but I would not call it a black art.