Have you ever noticed that when using a traditional 3.5mm wired headphone, the metal part of the plug is divided into different sections by black or white plastic rings? Ever wondered why this is the case and what purpose it serves? Let's take a closer look.
Most standard headphone jacks are either "three-pole" or "four-pole" plugs. The plastic rings between the metal sections act as insulators, separating the different signal paths. A three-pole plug typically includes the left audio channel, the right audio channel, and a common ground wire. This design is commonly used in basic earphones for music and video playback.
On the other hand, a four-pole plug adds an extra section for a microphone line. The order from top to bottom is usually: left channel, right channel, microphone, and ground. This allows for hands-free calling, making these types of headphones ideal for users who frequently make voice calls or use voice assistants.
When it comes to sound quality, headphones with a microphone often share the ground wire, which can lead to higher signal loss compared to those without. Additionally, the cable itself plays a role in audio performance. Since wires have electrical resistance, they can cause signal degradation, affecting both sound clarity and overall listening experience. So, under similar price points and models, earphones without a microphone might offer better sound quality.
Therefore, when choosing headphones, it's important to consider your specific needs. If you often use the microphone function for calls or voice commands, a four-pole plug model would be more suitable. However, if your main use is for music or immersive listening, a three-pole plug headphone might provide a more refined audio experience. Understanding these differences can help you make a more informed choice based on your lifestyle and preferences.
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