The localization of a sound depends also on Temporal Resolving Power.
Sound Localization: Because we may not consciously perceive the order, or even the discreteness of two very close successive stimuli, it does not mean that our perceptual system has lost track of the time intervals involved.
We actually are still processing them, but at a different level and in a different way.
Take for example a sound that comes to us from the extreme right side.
The sound wave first reaches our right ear, and then must travel the width of our face to reach the left. There is a brief time interval involved between the stimulation of each ear.
This is maintained as the sound continues in the form of a difference in phase between the input of each ear. But, the time interval is too brief for us to perceive two sounds.