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What are the ways to avoid speakers burning out?

Release time：2021-11-09

An important reason for the speaker to burn out the high notes is that the power of the power amplifier is too small, not too large. The signal sent by the power amplifier is a clipping signal, which causes damage to the speaker. Therefore, when equipping the speaker, you must establish a correct understanding and use the "big horse pulling a small cart" plan to prevent the power amplifier from sending out clipping signals and damaging the high and mid-range speaker units.

When designing the speaker system, the power of the power amplifier and the speaker should be matched according to the above criteria. In actual operation, the equipment of each link should be used reasonably to protect the equipment and enable the speaker system to achieve the best effect. For volume adjustment, many users set the attenuator of the post-stage power amplifier to -6dB, -10dB, that is, 70%-80% of the volume knob, or even in the general position, and rely on increasing the input of the mixer to achieve a suitable volume.

Thinking that the speakers are safe if the power amplifier has a margin is actually wrong. The attenuation knob of the power amplifier attenuates the input signal. If the input of the power amplifier is attenuated by 6dB, it means that in order to maintain the same volume, the mixer or pre-stage must output 6dB more, the voltage must be 1 times higher, and the input upper dynamic margin, commonly known as "headroom", will be cut in half.

At this time, if there is a sudden large signal, it will overload the mixer output by 6dB early, resulting in a clipping waveform. Although the power amplifier is not overloaded, the input is a clipping waveform, and the treble weight is too heavy, not only the treble is distorted, but the tweeter unit may also burn out.

Previous article: The difference between a pure power amplifier and a preamplifier

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