Your own risk.
We need a male stereo 1/8in headphone jack and a female 1/8in headphone cable socket.
The ground of the female is connected to the left pin of the male.
The 2 signal pins of the female are short circuited and connected to the right pin of the male.
Some 4 pin iPhone headphone-mic male to 2 female splitters do this when they are wrongly connected to a normal 3 pin headphone output.
Very useful for hearing the subtle detail of pop music such as delays used, reverbs, vocal harmonies.
In short the signal is taken from the male L and R output pins.
It can also be made with RCA connectors. A signal transformer is the best way. The primary is connected to L and R. The secondary is the output.
Reference:
Ear training part III - Euroelectron
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