Speakers 'disappearing' is what you want and where you need to be. Sure, if the guitar is on the right, in front (or behind) the speaker, thats where its going to come from. I remember the first time I achieved it and its a combination of speaker placement, a good hifi, cables and electricity, a good recording, good room acoustics, a bit of reading, tweaking and understanding. But, that's the beauty of the hobby.
Speakers "Disappearing"
I have read a lot about speakers "disappearing" so that one can't tell from where the sound is emanating. But, what about all the stereo tunes where the recordiing engineer intentionally pans the music to come from one side or the other? Can the speakers be made to "disappear" in that situation? Or, is it just the nature of the particular recording?