Quote Originally Posted by Macca View Post
the guitar in the room has a spherical sound field, stereo playback doesn't. So it's never going to sound the same.
The player's body will distort the sound field from being spherical to something more 'cardoid' in nature. A properly miked up guitar (say using a Calrec Soundfield microphone) will correctly replicate the sound field on a two-channel system, provided there is minimal phase shift with frequency.