People make efforts to maximize the perceived loudness of the loudspeaker of portable devices, must be careful to avoid damaging the speaker itself. These small transducers can only withstand such a large volume of limited volume. The existing two main speaker protection aspects - the maximum film offset and the maximum voice coil temperature.

The physical limits of the motion of the film can be clearly seen in the typical speaker profile, especially in the downward direction. The audio signal is not allowed too strong, otherwise it will lead to the vibration element contact to the fixed frame components, or cause the suspension material (ring or missile) excessive tension. In addition, the RMS value of the audio signal does not allow too large, otherwise it will cause the voice coil overheating. The circular shape of the coil tube can be deformed, causing the friction between the edge of the magnet or the magnetic pole piece. In addition, the high temperature in the voice coil can cause the electrical insulation performance degradation, which leads to the short circuit of the voice coil. The voice coil temperature is too high will make permanent magnet heating, may lead to the demagnetization.

To prevent damage to the technology including speakers: according to the input signal amplitude and / or power supply voltage automatic gain control (AGC), dynamic range compression (as mentioned above), hard limiting, flexible cutting sound, and a sense amplifier output. The disadvantage of these techniques is that they are feedforward methods, which can not be sensed by the actual speaker sound offset, the voice coil temperature, or the speaker impedance (which changes in proportion to the temperature). More sophisticated protection mechanisms such as thermal feedback are expected to be implemented in the future, but the current conventional method is one or more of the above mentioned protection mechanisms.

人们做出种种努力以期最大限度地提高便携设备扬声器发出的感知响度，必须小心避免扬声器本身的损坏。这些小型换能器仅能承受这么大的有限音量。现有两个主要的扬声器保护方面--最大薄膜偏移和最高音圈温度。

为典型的扬声器剖面图，可以清楚看到薄膜运动的物理极限，尤其是向下方向。音频信号不允许过强，否则会导致振动元件接触到固定盆架组件，或导致悬架材料(环形圈或弹架)过度拉紧。此外，音频信号的RMS值不允许太大，否则会导致音圈过热。音圈过热会使线圈管的圆形变形，引起与磁体或磁极片边缘的摩擦。而且，音圈中的高温也会导致其电气绝缘性能劣化，最后致使音圈的线匝短路，从而降低音圈阻抗而使放大器过载。音圈温度过高也会使永磁体受热，可能导致其退磁。 

用于防止扬声器损坏的技术包括：针对输入信号幅度和/或电源电压进行自动增益控制(AGC)，动态范围压缩(如前所述)，硬限幅，柔性削音，以及放大器输出过流感测。这些技术的缺点在于它们都是前馈式方法，无法感测实际的扬声器音盆偏移、音圈温度、或扬声器阻抗(其随温度按比例改变)。热反馈等更复杂的保护机制有望在未来实现，但目前的常规方法是上述提及的一种或多种保护机制