Bob Cordell has a good book on amps. Nelson Pass has a lot of great Burning Amp lectures and literature. Mr. Carlson's Lab on YouTube is great and he runs classes on Patreon. Can't tell you much about speakers. I have no desire to crack that can of worms. Way too complicated.
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I found this course online by university of Rochester on Coursera a free course and If want certificate pay $49. Any thing like this courses offered by Universities? https://www.coursera.org/learn/audio-engineering/