According to what he said, I can basically understand the process of making this video and I was also curious about the final output. At first, I can clearly hear each word and each sentence of the speaker. Gradually, I felt a sense of space when the sounds come up. It seems that simply though the piece of audio I can image the speaker sit in a big room. With time went by, this sense of space becomes stronger and stronger with the repetitive record. At around 11:00, the sounds of the speaker become muddled and at the same time, the environmental sounds become louder. I cannot clearly hear what the speaker exactly said. But I still wander the following change of the sounds because the sounds now have no literal meaning. At the end of the audio, I felt that there is no person in the room and the sounds are also no longer made by the speaker but by the room itself.
When I listen to this audio without reading the article, I was confused about the true purpose of the artist. Instead of using traditionally musical means to create sounds, Lucier used a technological process to reveal naturally occurring acoustic phenomena. It seems that he wants to cancel the subjectivity of human and create real environmental sounds. But this is only my personal guess. Overall, this audio really brings me in a room and relaxes me.