In the process of sound reinforcement of a pair of speakers suddenly no sound, most of them because the output channel on the power amplifier overload, fast fuse fuse, in this case replace the same capacity fast fuse, reduce the power amplifier input signal level, you can resume normal operation. If the speaker is still silent after replacing the fuse, not allowed to check the front of the device has no signal to send. Using the jumper method, that is, skip the previous device, the previous device's input signal into the input of the power amplifier, if there is still no sound, it may be the power amplifier power supply part of the damage or two channels at the end of the power burn, to ensure that the sound reinforcement continues, should be replaced early power amplifier. Two speakers at the same time instantly burned is unlikely...