this post was submitted on 22 Nov 2025
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It's not that hard to grasp I don't think. If you understand graphs of soundwaves, it's literally just the wave scratched into the plastic. The movement of the needle dictates the movement of the speaker membrane which results in the same movement in your eardrum. Which is what you percieve as sound.
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Even simpler to visualize: Its the movement of the membrane of the speaker/microphone turned into a physical line.