Okay, so you want to learn more about immersive 3D Audio and Dolby Atmos. In this short guide I will go over some fundamentals, starting off with - What Are Channels ?
Above here's an example of a typical layout. A 7.1.4 channel bed. But what does this mean ? Here's a key to the numbers:
A = 7 horizontal speakers, at Ear level
B = This is the Sub speaker, also known as the LFE (low frequency effects) for the cinema
C = 4 or more speakers that are set above you, known as the heights. example here two speakers are set in front of you at height, and the other two are behind you at height in the rear
Now we also need to label each of the speakers in our 7.1. 4 layout. Above in this image as an example we label what is at our ear level, what is at our height and what is on the floor. For this we can use acronyms.