Why does the speaker always burn high pitch?

　　Why does your sound system keep breaking for no apparent reason? And you can't find the reason? So have you paid attention to the treble part of the audio, let's explain in detail how the tweeter causes the audio to burn out.

　　The tweeter is the weakest link in the speaker. When the speaker is damaged, the tweeter is often the first to be damaged. Of course, improper use will also burn the woofer. When designing speakers, the factory generally reserves a certain margin under the premise of rated power, and the power allocated to the treble part is about 45W (generally, the power allocated by the tweeter in the music signal is about 30% of the rated output power. ), the actual distribution power of each tweeter does not exceed 15W when driven by 150W, while the rated power of the tweeter is 20W, and there is a 25% margin. After visiting a large number of users, we found that the vast majority of "burning speakers" are caused by improper use, mainly in the following aspects:

　　The power of the audio amplifier is not properly matched. Some customers choose an 8Ω power amplifier to match a speaker with a rated power of 120W, but as long as the actual power allocated to each tweeter is 25W, it has exceeded the rated power of the tweeter, causing damage to the tweeter. The actual output power of the power amplifier can be measured by the customer: the power amplifier is correctly connected to the speaker, the volume knob of the power amplifier is turned on, and the voltage at the output end of the power amplifier is measured with a multimeter (the needle will swing, and the maximum value must be taken), and then use the measured voltage. The square value of the value is divided by the impedance value of the speaker to get the output power of the power amplifier at this time.

　　But when using it, the mouth must be in a positive dialogueIf it is too far away, or not facing directly, it will cause "insufficient input", especially the loss of bass will be great. Ordinary entertainment guests may not have these "professional knowledge" and complain that they are tired of singing. To solve these problems, we need to teach our waiters to help and teach the guests, but the method must be appropriate, and the guests must not be accused. It is best to hang a picture on the wall indicating the correct use of the microphone.

　　Improper opening and closing operations. In some karaoke places, the waiters turn on the power amplifier first, and then turn on the audio source (VOD or DVD) during the power-on and power-off operation. Go to the power amplifier, and then insert the switched microphone into the connected XLR head, resulting in a very strong impulse current, and the loudspeaker will make a strong "beep" sound in an instant. damage the horn. The correct operation method is: turn on the audio source first and then turn on the power amplifier when powering on, turn off the power amplifier and then turn off the audio source when powering off. When the microphone is inserted into the power amplifier, make sure that the microphone has been connected to the connection, and ensure that the microphone switch is in the off state.

　　Connection failure. The wiring fault is also the culprit of "burning the horn". If the signal line from the audio source to the power amplifier is disconnected from the ground wire (sometimes the ground wire is in poor contact, it is on and off), it will cause the amplifier to produce "high frequency self-excitation", which will burn the horn. , retest the burn-in amplifier. Sometimes the microphone cable is not in good contact with the microphone (mostly the XLR head is loose), or the microphone tip is not in good contact with the power amplifier, or the microphone is disconnected from the ground wire (single-core wire is disconnected from the shielding network), which will cause a strong impact, and the speaker appears very strong. The "card... card burst sound, which will also damage the speaker in an instant.

　　Just repeat the above knowledge system review for the operation of entertainment audio, and then use the treble and the normal use of the microphone reasonably. Generally speaking, the life of audio can reach about 10 years, but it is also necessary to consult the maintenance of audio equipment of the manufacturer in time if you do not understand it.

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