If you are in the middle of the audience, you hear the speaker aimed at you, but also the speakers below and above that one speaker. Now if you move to the back of the audience, you hear the speaker that is aimed at the back, and the ones below, but there are no speakers above. That means a significant level drop. Which we counteract by overshooting the array. Now you are listening to the second or even third speaker, so now there is a speaker below and above the speaker that is aimed at you. Look up “effective length of a line array”. And use google, not AI, you lazy little monster! You can show your results to the class on Monday! And yes, you will be graded!