When we were using a wired 3.5 mm plug earphone, did we find that the metal rod of the headphone plug was divided into several sections by a black or white plastic ring. Do you know why? What is the use?
Our common headphone plugs are generally divided into "three-wire plugs" and "four-wire plugs." The plastic rings above are insulators that separate them. The “three-wire plug†is divided into a left channel speaker, a right channel speaker, and a common ground wire.
The "four-wire type plug" has one more microphone line than the "three-wire type plug". From start to finish are: left channel, right channel, microphone, ground wire. In other words, the "three-segment plug" headphones can only watch movies and listen to music, while the "four-wire plug" headphones can not only watch movies, listen to music, but also make voice calls.
For the sound quality of the headphones, in the headphones under the same conditions, since the headphones with the microphone share the ground line, the signal transmission loss rate is greater than that without the wheat. It should be noted that the headphone cable has an impact on the sound quality of the headphones. The wire is electrically conductive and has resistance, which is easy to cause signal loss, which greatly affects the sound quality of the earphone and the user experience. So, under the same price and model of headphones, headphones without a microphone may be better than headphones with a microphone.
Therefore, when we choose headphones, we must also choose according to our own needs. In the case of similar price, if you use the voice of the headset a little more, it is undoubtedly the choice of "four-wire plug" with a microphone headset. If you are listening to music and purifying your mind, it is very suitable to choose a "three-wire plug" earphone.
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