expected with a tolerance of +/-5% usually. Even the same make and model of headphones can have variations in their specifications - all specifications are nominal i.e. This is because different makes of headphones have different impedances which the output device (phone, amplifier, etc.) sees as a variable load and so ends up providing variable output power which one moment can be too much and the next not enough to drive the different headphones. Unfortunately this project suffers from a basic flaw - the implementation means that any set of headphones can load the other set(s) and therefore introduce distortion to all sets. It's always a good idea to check in order to make sure there are no shorts and no broken contacts. Once you have identified the contacts on the male side, plug it into one of your female jacks and measure the resistance between the known wires and the contacts on the female jack. Otherwise, you already have your ground and two sides. The front is left, and the middle is right. If you care about left and right, check the resistance from the remaining wires to the jack. You can identify the ground either by measuring the resistance between each wire and the end of the jack, or by finding the pair of wires that have no resistance between them. Often the two ground wires are the same color, and the left and right are two more colors. You will have four wires, two ground, the left, and the right. Strip some of the insulation off the ends of both wires attached to the male jack. I'm sure there's some sort of industry standard here, but I didn't bother to check.
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