5. On-site voltage instability
Sometimes the voltage at the scene fluctuates from high to low, which will also cause the speaker to burn out. Unstable voltage causes components to burn out. When the voltage is too high, the power amplifier passes too much voltage, which will cause the speaker to burn out.
6.Mixed use of different power amplifiers
EVC-100 Trs Professional Karaoke Amplifier
In engineering, there is often such a situation: power amplifiers of different brands and models are mixed. There is a problem that is easily overlooked-the problem of the input sensitivity of the power amplifier. There is another problem that is often overlooked, that is, power amplifiers of the same power and different models may have inconsistent sensitivity voltages.
FU-450 Professional Digital Echo Mixer Power Amplifier
For example, the output power of two power amplifiers is 300W, the input sensitivity of A power amplifier is 0.775V, and the input sensitivity of B power amplifier is 1.0V, then if the two power amplifiers receive the same signal at the same time, when the signal voltage reaches 0.775V, A power amplifier outputs It reached 300W, but the output of power amplifier B only reached 150W. Continue to increase the signal level. When the signal strength reached 1.0V, power amplifier A was overloaded, and power amplifier B just reached the rated output power of 300W. In such a case, it will definitely cause damage to the speaker unit connected to the overload signal.
When power amplifiers with the same power and different sensitivity voltages are mixed, the input level of the power amplifier with high sensitivity should be attenuated. Unification can be achieved by adjusting the output level of the front-end equipment or reducing the input potentiometer of the power amplifier with high sensitivity.
E-48 China Professional Amplifier Brands
For example, the above two amplifiers are 300W output power amplifiers, the sensitivity voltage of one is 1.0V, and the other is 0.775V. At this time, reduce the input level of the 0.775V amplifier by 3 decibels or turn the amplifier level knob Put it in the -3dB position. At this time, when the two amplifiers input the same signal, the output power will be the same.
7.The large signal is disconnected instantly
DSP-8600 Karaoke Digital Processor
In KTV, many times the guests in the box or the DJ have a very bad habit, that is, cut songs or mute the sound under loud pressure, especially when playing Di, it is easy to cause the voice coil of the woofer to snap or burn out.
DAP-4080III China Karaoke Professional Digital Audio Processor
The audio signal is input to the speaker through the current method, and the speaker uses electromagnetic force to push the paper cone to move back and forth to make the air vibrate into sound. When the signal input is cut off suddenly during a large-scale movement, it is easy to cause the loss of recovery ability after the movement reaches a certain level,so that the unit is damaged.
Post time: Nov-17-2022