Submitted by caedin8 t3_103appl in askscience
vilette t1_j49gmsv wrote
Reply to comment by electric_ionland in How is stereo information encoded into a vinyl record? by caedin8
not exactly, the vertical move is the sum: left + rigth, and the horizontal move is the difference: left -rigth
the electronics add both and substract both to have left and rigth
this way it is compatible with a mono player
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