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ASAP can someone please explain this to me please and thank you.

this is for my project for physical science

ASAP can someone please explain this to me please and thank you. this is for my project-example-1
User HeySora
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I think it might be either analogue or digital signal and then some headphones have surround sound, but I'm on a C grade in physics so I don't know much, hope this helped
User Parth Savadiya
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