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A $2000 pair of speakers that was positioned poorly in the room will sound worse than a $200 pair, placed correctly.
In my opinion this is the best one-page summary on speakers positioning. It explains very well the basic setup and the changes you should hear while tweaking and making adjustments to the distances between the speakers, the listener and the walls.
I own the book by Robert Harley, from which this excerpt was taken, and it is a great overall introductory guide to audiophiles. Thanks to his advice I had found ideal location for KEF LS50s in my small room. The difference between “before” and “after” was like night and day.