What causes this sound stripped sound when the 1/8 inch audio jack is partially disconnected?
When the plug begins to slip out of the socket, it is often the ground contact (sleeve) that disconnects first, leaving the two “hot” wires (left and right, terminal and ring) still connected.
With the ground open like this, both earbuds are still getting a signal, but now it’s the “difference” signal between the left and right channels; Any signal in phase in both channels cancels out.
Recording engineers tend to put the main audio signal right in the middle of the stereo image, so this is just one example of a signal in phase that disappears when the difference signal is heard.
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