In the audio system, the speaker unit is the easiest to be damaged. The general view is that the volume of the power amplifier is too large, and it is agreed to burn the speaker. In fact, it is not the case. There are many reasons for the burning of the speaker. Here are some of the most common situations, and I hope you will avoid them when using speakers.
If the power amplifier has a DC output, it will burn the woofer, even a very small number of tweeters. Because there is no capacitor on the bass (or other) speaker crossover circuit to isolate the DC, once there is a DC output, it is like passing the DC power into the speaker, and the crossover coil is burnt to black. Therefore, please pay attention when purchasing a power amplifier. First use the multimeter current file to measure whether the output terminals of the front and rear stages have DC output. If the front stage has a DC output, it may pass through the rear stage and then amplify the output to get the DC into and out of the speaker. (It is recommended to use the power amplifiers produced by large manufacturers as much as possible, and try not to choose other brand or DIY power amplifiers, because unless you have a very rich DIY experience for many years, you’d better not take your speakers to risk. Poor or immature design damages your unit. The problematic power amplifier should also try to solve the problem before using it. Many units burn out usually caused by abnormal current caused by abnormal potentiometer).
Too much volume will damage the speaker, but it is more likely that the power of the power amplifier is insufficient and the power amplifier is turned on loudly, so that the output of the power amplifier is not a normal sine wave, but a signal with other clutter components, which will burn the speaker. It is recommended that friends who like loud volume must buy a high-power amplifier. Small power amplifiers below 30W can easily burn out low-impedance speakers when the volume is too high.
When we use the microphone, if the microphone is too close to the speaker or directly facing the speaker, and the amplifier volume is turned on relatively large, it is easy to produce high-frequency acoustic feedback and cause howling, which will cause the tweeter to burn out, because the mid-to-treble tone passes through the crossover. Most of the signals are sent out from the tweeter. This high-energy signal all passes through the very fine coil tweeter, generating instantaneous high current, causing an instantaneous extremely high temperature, burning the voice coil wire, and the tweeter giving off a’Woo’ It broke after a scream. The correct approach is to not approach or face the speaker unit when using the microphone, and increase the volume of the power amplifier slowly from low to high, and don’t open it up all at once.
There will be no DC output in the rear stage of the electronic tube with output transformer, but you should pay special attention to the high-frequency oscillation or interference of the electronic tube machine. As soon as this occurs, your advanced speaker will be burned immediately.