Part of the language of sound system design and optimization has to do with horizontal and vertical planes. What do those terms actually mean?
First let’s visit WIKI:
WIKI – Horizontal and vertical
Now let’s get into how these concepts relate to sound localization which refers to a listener’s ability to identify the location or orgin of a detected sound in a direction and distance.
Now let’s move to the concept of interaural time difference or ITD which has to do with the difference in arrival time of a sound between two ears:
WIKI – Interaural time difference / ITD