What removes vocals from audio when the 1/8th audio jack is partially disconnected?

All QuestionsCategory: Electrical EngineeringWhat removes vocals from audio when the 1/8th audio jack is partially disconnected?
What removes vocals from audio when the 1/8th audio jack is partially disconnected?Shu She asked 4 months ago
Every now and then, the 8-inch audio jack will slip, and it looks like I’ll only lose the audio portion of the track – leaving somewhat of a “karaoke” version. What I’m guessing about how audio jacks work suggests I’d make this up; However, I have asked and others have told me they have tested this as well.
What causes this sound stripped sound when the 1/8 inch audio jack is partially disconnected?

1 Answers
What removes vocals from audio when the 1/8th audio jack is partially disconnected?Lucas Furst answered 4 months ago

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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