Why do I hear a Noise/Hiss in the IEM system?

Why do I hear a Noise/Hiss in the IEM system?
The most common hiss that is referred to is caused by RF interference. An important step in setting up a system is to tune the equipment properly to ensure that external RF signals are avoided and hence interference is avoided.

The other hiss that is sometimes noticed is the internal workings of the unit itself. The body back receiver has inherent noise from the components especially when there is a low input signal. This phenomenon is not unique to Sennheiser but occurs across all manufacturers. 

This internal noise is made more apparent when in a very quiet environment (like a recording studio) or when more sensitive ear buds (such as custom in-ear molds). From a practical standpoint once you have audio through the IEM system it will over shadow the noise from the internal components and most people will not even realize the noise it there.

中文：
为什么我在IEM系统中听到噪音/Hiss？
最常见的嘶嘶声是由射频干扰引起的。建立系统的一个重要步骤是正确调整设备，以确保避免外部RF信号，从而避免干扰。
有时会注意到的另一个嘶嘶声是单元本身的内部工作。体背式接收器具有来自部件的固有噪声，尤其是当存在低输入信号时。这种现象并非森海塞尔独有，而是所有制造商都会出现。
当在非常安静的环境中（如录音室）或更敏感的耳塞（如定制的耳模）时，这种内部噪音会变得更加明显。从实用的角度来看，一旦你通过IEM系统获得音频，它就会掩盖内部组件的噪音，大多数人甚至不会意识到那里的噪音。

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文章来源：刘俊涛的博客

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