Headphones can record sounds because their drivers work on the same principle as dynamic microphones. They both have a tiny coil within a magnetic field. When you’re using headphones, electrical signal makes the coil move, which pushes air and generates sound. Microphones reverses the process, sound vibrations pushes the coil to create electrical signals. So when you talk into your headphone driver, the same thing happens. The sound moves the coil and generates electrical signal as if it’s a mic
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