Science Buddies: "Ask an Expert"

I have read the blog post, https://www.arkartech.net/blogs/blog/bl ... headphones
but I still don't understand.

This forum is for students working on their science fair project. Is this question part of a science fair project? If so, please tell us more about your project and how it relates to the website. Otherwise, there are other forums more appropriate for your question. Thank you!